Question
Buses start from a bus terminal with a speed of 20 km/hr
at intervals of 12 minutes. What is the speed of a boy coming from the opposite direction towards the bus terminal if he meets the buses at intervals of 10 minutes?Solution
Let the speed of boy = x kmph According to the question, Distance travelled by bus in 12 min with 20 kmph = Distance travelled by boy in 10 min with (20 + x) kmph in opposite direction => 20 × 12/60 = 10/60 (20 + x) => 240 = 200 + 10x => x = 40/10 = 4 kmph.
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