The concorde is the fastest airlines used for commercial service. It can cruise at 1450 mile per hour (about two times the speed of sound or in other words, mach 2). What is it in m/s?

(a) What is the speed of sound in air at 0^@ C in miles per hour ? (b) What is the approximate value od speed of sound in air at 20^@ C in km/s ?

An airline company purchased two new airplanes. One can travel at speeds of up to 600 miles per hour and the other at speeds of up to 720 miles per hour. How many more miles can the faster airplane travel in 12 seconds than the slower airplane?

A man covvers a distance olf miles at a speed of s miles per hour and another distance , D at 3 s miles per hour. If D gt 2d , and the man makes the entire journey within 2 hours , and d lt ks , what is the value of K ?

Brian plans to complete a 100-mile bike race for charity. According to his registration materials, he will need to ride at an average speed of 12.5 miles per hour if he wants to complete the course before it closes. On a pratice ride the week before the race, Brain rides 60 miles and trackes his speed. For the first 30 miles, his average speed is 16 miles per hour, and for the next 30 miles, his average speed is 15 miles per hour. If Brian can match these speeds for the first 60 miles of the charity race, then he rests for that total of 1 hour after that, what approximately speed must he maintain for the last 40 miles in order to complete the ride on time?

An airline flies, two different planes over the same route. The faster of the two planes travels at an average speed of 540 mile per hour,and the other plane travels at an average speed of 450 miles per hour. How many more miles can the faster plane travel in 12 seconds than the slower plane?

A freight train and a passenger train start toward each other at the same time from two towns that are 500 miles apart. After 3 hours, the trains are still 80 miles apart. If the average rate of speed of the passenger train in 20 miles per hour faster than the average rate of speed of the freight train, what is the average rate of speed, in miles per hour, of the freight train?

A man strikes one end of a thin rod with a hammer. The speed of sound in the rod is 15 times the speed of sound in air. A woman, at the other end with her ear close to the rod, hears the sound of the blow twice with a 60 ms interval between, one sound comes through the rod and the other comes through the air alongside the rod. If the speed of sound in air is 343 m/s, what is the length of the rod?

A cyclist maintains a constant speed on his bicycle . The graph above shows the number of miles he covers in x hours . Two points on the graph are (2,10) and (3,15). What is the cyclist's speed in miles per hour ?

The reduction is speed, r in miles per hour of an enginge having n bogies attached to it is given as : r = 4sqrt(n) . The final speed, s, in miles per hour , at which the engine can pull the n bogies attached is give as : s = 40 - r . What is the maximum number of bogies that the engine call pull ?