train without stoppage travels with an average speed of 80 km/h and with stoppage,it travels with an average speed of 72 km/h. For how many minutes does the train stop on an average per hour?
With stoppages speed = 72 kmph
Without stoppages speed = 80 kmph
Let the total distance = L.C.M of 80 and 72= 720
So, time taken with stoppages =Â $$\frac{720}{72}=10\ hr$$
Time taken without stoppages =$$\frac{720}{80}=9\ hr$$
Difference = 1 hr
In 10 hour trip 1 hour is spend on stoppages.
Per hour train stops for =Â $$\frac{1}{10}\times60=6$$
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