Question : Two donkeys are standing 400 metres apart. The first donkey can run at a speed of 3 m/sec and the second can run at 2 m/sec. If two donkeys run towards each other, after how much time (in seconds) will they bump into each other?
Option 1: 60
Option 2: 80
Option 3: 400
Option 4: 40
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Correct Answer: 80
Solution : Here the distance between two donkeys = 400 metres. Speed of the first donkey = 3 m/sec. Speed of the second donkey = 2 m/sec. If both running in opposite directions relative speed = (3 + 2) = 5 m/sec. So, the time taken to bump into each other = $\frac{400}{5}=80$ sec. Hence, the correct answer is 80.
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