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2 best approaches -
1. Logical -
Every hour, the train is actually traveling at 80 for some time and then stopping. Distance covered = 60km.
Time required to travel 60km at 80Kmph = 6/8 hour = 3/4 h. Therefore stoppage time = 1/4h = 15 mins.

2. weighted avg --->
80 ------------ 0
--- 60 ---
60 ------------20
=> time ratio = 3:1 => 15 mins stoopage per hour
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Tricked me!
Took in respect to 3 instead of 4 here

So 80t1=60t2
4/3t1=t2
Or time with stoppages is 4/3 times time without stoppages

when t1 becomes 1 it becomes simply 4/3
Now there is an extra 1 hour because of stoppages spread over 4 hrs.
Therefore 1hr/4 = 60/4 = 15mins
einstein10
Without stoppages a train travels a certain distance with an average speed of 80 kmph and with stoppages it covers the same distance with an average speed of 60 kmph. What is the time in minutes per hour for which train stops?

A. 15 min/hr
B. 10 min/hr
C. 20 min/hr
D. 25 min/hr
E. None
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