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.

Explanation

To solve the problem step by step, we will analyze the situation described in the question.

### Step 1: Understand the scenario
An engine blows a whistle when it is 0.9 km (or 900 meters) away from a hill. The echo of the whistle is heard by the driver after 5 seconds. The speed of sound in air is given as 330 m/s.

### Step 2: Convert distance to meters
The distance from the engine to the hill is given as 0.9 km. We convert this to meters:
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