1.

A bus travelled the first one-third distance at the speed of 10 km/h, the next one-third at 20 km/h and the leone-third at 60 km/h. The average speed of the bus is(A) 9 km/h(B) 16 km/hC 18 km/h(D) 48 km/h

Answer»

Let total distance be x

It covered x/3 at 10x/3 at 20x/3 at 60

Times taken respectively are { d / t } x / 30x / 60x / 180 respectively

total time = x/30 + x /60 + x/180= 10x / 180= x / 18

Average speed of bus (avg s )= total distance / total time

avg s = x / {x/18}avg s = 18 km / h

(C) is correct option

18 is right .

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