RRB Group D 3-Dec-2018 Shift 3 Solved Paper

Question : 86 of 100

Marks: +1, -0

A person driving at a speed of 45 km/h reaches office 5 minute early while she reaches 7 minute slate if driving at 27 km/h. What is the distance (in km) that she is covering?

16.5
18
15
13.5

Validate

Solution:

Let distance = D km
Actual speed to reach office on time = x km/hr
Thus, from the question

D/x-D/{45}=5/{60}

...(1)

D/{27}-D/x=7/{60}

...(2)
eq. (1)+ (2)

D/{27}-D/{45}=5/{60}+7/{60}

D[{45-27}/{27×45}]={12}/{60}

D={12×27×45}/{18×60}

D= 13.5 km

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