RRB Group D 24-Sep-2018 Shift 1 Solved Paper

Question : 90 of 100

Marks: +1, -0

A train completes a journey in 8 hours, the first half at

45 \ { km} \/ {h}

and the second half at

55 \ { km} \/{h}

.
The total length of the journey is :

Solution:

By shortcut method:

{T}=8 {hrs}, {S}_{1}=45 {km} \/ {hr}, {S}_{2}=55 {km} \/ {hr}

ATQ,
Total length of the Journey

={2 { T}({S}_{1}×{S}_{2})}/{{S}_{1}+{S}_{2}}

={2 \×8 \×45 \× 55}/{45+55}

={39600}/{100}=396 { km}

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