self Maths Puzzle

the average speed of train without stoppages is 150 kp/h. its average speed with stoppages is 120 kp/h. find the number of minutes it stops every hours?

Read Solution (Total 3)

12 minutes...without stoppages 150 kp/h means 2.5 km per minute.. to cover 120 km it takes 48 minutes.. so the stoppage time for an hour is 60-48=12 minutes.
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15 mins it stops
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pls explain how to solve this
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self Other Question

Two persons A and B started simultaneously from the some point along two roads perpendicular to each other at speed of 40 kmph and 42 kmph. what would be the shortest distance between then after half an hour? At 8am a truck travelling at 60km/h was 3 km behind a bus. At 8:45am, the truck was 12km ahead of the bus. find the speed of the bus(in kmph)