A engine is approaching a hill at constant speed. When it is at a distance of `0.9 km`,
Channel: Doubtnut
Date: 2020-08-02

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.