Time, Speed & Distance
Aptitude

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Q.

Excluding stoppages, the speed of a bus is 54 kmph and including stoppages, it is 45 kmph. For how many minutes does the bus stop per hour?

 A.

4

 B.

6

 C.

8

 D.

None of these

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Solution:
Option(D) is correct

Due to stoppages, it covers 9 km less.

Time taken to cover 9 km = \(\dfrac{9}{54}\times 60\) = 10 min.


(3) Comment(s)


Swastik Acharya
 ()

I think 12 minutes would be correct because it will travel by 45 km/hr by then, so it takes 9/45= 1/5 hr= 12 minutes


Kelly
 ()

No, 10 min in the solution seems correct to me. We are calculating stop time, so it has to be from the view of bus not stopping.


Suhail Ahmed
 ()

The short-cut formula is:

$\dfrac{S_1-S_2}{S_1}$

or

$\dfrac{\text{Difference of Speed}}{\text{Speed without stoppages}}$.


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