Question
A thief was running at 7 m/s when a policeman started
chasing him at 12 m/s. The thief was 140 metres ahead initially. Find the time taken by the policeman to catch the thief.Solution
Relative speed of policeman w.r.t thief = 12 − 7 = 5 m/s
So, required time = 140 ÷ 5 = 28 seconds
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