A engine is approaching a hill at constant speed. When it is at a distance of `0.9 km`, it blows a whistle, whose echo is heard by the driver after `5 s`. If the speed of sound is `340 m//s`, calculate the speed of the engine.

An engine approaches a hill with a constant speed. When it is at a distance of 0.9 km it blows a whistle, whose echo is heard by the driver after 5 sec. If the speed ofsound in air is 330 m/s, calculate the speed of the engine.

An engine approaches a hill with a constant speed. When it is at a distance of 0.9 km, it blows a whistle whose echo is heard by the driver after 5 seconds. If the speed of sound in air is 330 m/s, then the speed of the engine is :

An engine approaches a hill with constant speed and where it is at a distance of 1 km blows a whistle whose echo is heard by the driver 5s. If the speed of the sound is 340 ms^(-1) . The speed of the engine is

The echo of a sound is heard after 5 seconds. If the speed of sound in air be 342m/s, calculate the distance of the reflecting surface.

The sound of thunder is heard 3 s after flash of lightning. If the speed of sound is 340 m/s, find the height of the cloud.

A car is moving with a speed of the 72 Kmh^-1 towards a hill. Car blows horn at a distance of 1800 m from the hill. If echo is heard after 10 s.the speed of sound ("in" ms ^-1) is