Question

A body travel a distance of 10km with a constant speed of 30 km/ h and then the next 40 km at a constant speed of 50 km/h. find the average speed for the whole journey.

Answer 1

D1=10 km.
T1=10/30=1/3hr.

D2=40km.
T2=40/50=0.8hr

Average speed=d1+d2/t1+T2
10+40/1/3+0.8=45.4km/hr

Answer 2

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