A car covers 1/3 of the distance with 60km/h during the journey and the remaining distance with 30km/h. What is the average speed during the journey?
A36 km/hr
B50 km/hr
C24 km/hr
D64 km/hr.
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A boy goes to his school from his house at a speed of 3 km/hr and returns at a speed of 2 km/ hr. If he takes 5 hours in going and coming, the distance between his house and school is :