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Q.

A car covers 13 part of total distance with a speed of 20km hr-1 and second 13part with a speed of 30 km hr-1and the last 13part with a speed of 60 km hr-1. The average speed of the car is

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a

55 kmhr-1

b

30 kmhr-1

c

45 kmhr-1

d

37.3 kmhr-1

answer is B.

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Detailed Solution

t1= x320 = x60; t2 = s330 = s90t3 = s360 = s180vav = st1+t2+t3= ss60+s90+s180 = 30 km/h
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