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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?
A9
B10
C12
D20
ENone of these
Show Explanation
Speed of the bus excluding stoppages =54 kmph
Speed of the bus including stoppages =45 kmph
Loss in speed when including stoppages =54−45=9 kmph
⇒ In 1 hour, bus covers 9 km less due to stoppages.
Hence, time in which the bus stops per hour
= Time taken to cover 9 km
=distancespeed=954 hour=16 hour =606 min=10 min
Asked In ::
Speed of the bus excluding stoppages =54 kmph
Speed of the bus including stoppages =45 kmph
Loss in speed when including stoppages =54−45=9 kmph
⇒ In 1 hour, bus covers 9 km less due to stoppages.
Hence, time in which the bus stops per hour
= Time taken to cover 9 km
=distancespeed=954 hour=16 hour =606 min=10 min
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Solution:
Speed of the bus excluding stoppages =54 kmph
Speed of the bus including stoppages =45 kmph
Due to stoppages, it covers 9 km less. Time taken to cover 9km = ( 9*60)/54 min = 10min
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