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Q.

The maximum speed of a bus is 54 kmph. If stoppages are included; the average speed of the bus reduces to 45 kmpb. Find out for how many minutes did the bus stop per hour.

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a

12

b

10

c

20

d

9

answer is C.

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Detailed Solution

Required minutes that the bus stop per hour $= \frac{(54 - 45)}{54} \times 60 = \frac{9}{54} \times 60 = 10 \min$

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