An engine approaches a hill with a constant speed. When it is at a distance of 0.9 km, it blows a
Channel: Doubtnut
Date: 2020-08-23

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 :