4: A police car is chasing a criminal on bike.The speed of police car is 120 mph while the speed of the criminal's bike is 100 mph. How much time is required to catch the bike if both are 5 miles apart?
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Explanation:
Relative displacement / relative speed = 5/20 = 0.25 hrs = time
2.5 ×6 min = time
15 min = time
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