In dry air at 20 C (68 F), the speed of sound is 343.2 metres per second (1,126 ft/s 1,236 km/h 768 mph 667 kn), or a kilometre in 2.914 s or a mile in 4.689 s.
Therefore, 1 mile is equivalent to 1.609344 kilometers. The speed of sound is the distance travelled per unit time by a sound wave as it propagates through an elastic medium. The units are defined as follows: An object moving at 1 "mph" per hour will cover a distance of one mile. For example, if a vehicle travels at a speed of 100 miles per hour (100 mph), it will move around 160 km per hour in the metric system. The speed of light can also be written as 186,282 miles per second. Therefore, the metric system is defined in miles (instead of kilometers) per time unit. A speedometer is a great example of instantaneous speed. The unit of length known as a "mile" and it should not be confused with the nautical mile and very commonly used in the Anglo-American countries. Imagine, if the start shot was fired at the finish line, it would take about 0.3 seconds of time to hear the shot in the start blocks. Another example, in a 100-meter sprint, the starting shot is fired directly next to the starting blocks. The speed of sound is often illustrated by an example of a thunderstorm: if lightning strikes within 3 seconds of the thunder sound, then the thunderstorm is about 1 kilometer away. Actually, it is equivalent to 1.234,8 km/h. It measures only 3.6 km.Definition: If an object travels at the speed of sound in air at 20 degrees Celsius for one second, it travels a distance of 343 meters per second. The road from the cottage to the shop 6 km away leads either along a straight road that the bicycle can drive at a speed of 18 km/h or by "shortcut". It took 4 hours for the two to meet if Jake's speed was 15 mph slower than Brian's speed. What is his average speed for the entire trip?īrian and Jake left their homes, which are 500 miles apart, and drove straight toward each other. The fastest possible speed of sound 22.4 miles per second, nearly twice its speed in air at the Earth's surface has been calculated for the first time. he then traveled back home on the same path at a speed of 24 miles per hour. Starting at home, Tony traveled uphill to the store for 45 minutes at 8 miles per hour. Use the following facts to convert this units: 1 meter = 39.37 inches, 1 mile = 1609 m, 1 hour = 60 minutes Express it in miles per hour, correct to three significant figures. 5 miles it takes 2 1/2 × 1/40 1/16 0 At 25☌, sound can travel 100 meters across a football field in 0 The range of the aircraft, with 100 passengers and 9 crew, under the correct conditions is about 4,500 miles So sound travels 1 kilometer in roughly 3 seconds and 1 mile in roughly 5 seconds So sound travels 1 kilometer in roughly 3. The speed of the mail train is 1370 meters per minute. When did the faster caravan run slower? How far from the oasis? Two hours later, a second caravan followed her at 2.5 miles per hour. Find how long it takes her to drive round-trip if she averages 40 mph.Īt 6:00 in the morning, a caravan set out of the oasis at a speed of 1.5 miles per hour. She must go to the law library in city B to get a document. After how many hours will the cars be 30 miles apart?Ī woman works at a law firm in city A which is about 50 miles from city B. If John starts running at 10:00 am, and Lucy starts running at 10:30 am, at what time will they meet? (as soon as possible)Īt 9:00 AM, two cars started from the same town and traveled at a rate of 35 miles per hour, and the other car traveled at a speed of 40 miles per hour.
If John has a running speed of 3.5miles per hour and Lucy has a speed of 5 miles per hour. What is the speed of sound in units of meters per second (1 km 0.
How many hours did it take Ed to drive to New Jersey? The speed of sound at one atmosphere of pressure is 0.214 miles per second. How far can she walk in 2 hours 45 minutes?Įd drove to New Jersey at 30mph. Lucie can walk about 3 4/5 miles each hour. 5 Miles per second 23.4598 Speed of sound, 50 Miles per second 234.6 Speed of sound, 50000 Miles per second 234598.25 Speed of sound 6 Miles per second. What is the unit rate that this train is traveling per hour? Write in miles per hour.Ī plane is flying at the rate of 350 mph after an eight hour flight is at its destination how far did the plane fly? Conversion of a velocity unit in word math problems and questionsĪ train can travel 1136 miles in 4 hours.