Avg speed of train is 54 km per hour if it doesn't stop whereas its avg speed reduces to 36 km per hour if it keeps on taking stoppages . If driver decides to take stopages then for how many minutes train stops in one hour .
Answers
Answer:
20 minutes
Step-by-step explanation:
It is given that, excluding stoppages, the speed of a bus is 54 kmph.
⇒ Distance travelled by train in 1 hour,
excluding stoppages = 54 km.
Also, it is given that including stoppages the speed of the bus is 36 km/hr.
⇒ Distance travelled by the bus in 1 hour, including stoppages = 36 km.
(Distance travelled by bus in 1 hour excluding stoppages – distance travelled by bus in 1 hour including stoppages)
⇒(54km−36km)
⇒18 km
That means, due to stoppages, the bus covers 18km less.
Hence, time taken to cover 18 km,
=distance travelledspeed/speed of the bus
It is given usual speed of the bus = 54 km/hour
∴∴ Time taken to cover 18 km =18km/54kmph
=1/3 hours
Time taken in minutes =(1/3)×60minutes
=20 minutes
(Since, 1 hour = 60 minutes)
Therefore, the bus stops per hour for 20 minutes.