A thief escapes on a scooter at 40 km/h. Half an hour later a police jeep sets off from the same place at 50 km/h. How long after the jeep starts will it catch the thief?
Correct answer C. 2 hours
Explanation
Thief's lead = 40 × 1/2 = 20 km. The jeep gains 50 − 40 = 10 km every hour, so it catches up in 20 / 10 = 2 hours.
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