RRB Group D 10-Oct-2018 Shift 2 Solved Paper

Question : 63 of 100

Marks: +1, -0

A train travels a distance between two stations, X km apart, at a speed of 60 km per hour for the onward journey and

90 \ { km}

per hour on the return journey. What is the average speed of the train ?

Solution:

Average speed =

{\text " Total distance travelled "}/{\text "Total time taken "}={X+X}/{{X}/{60}+{X}/{90}}

= {2 X}/{{5 X }/{180}}={2 \× 180}/{5}=72 {km} \/ {h}

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