8RB Group D 23-Sep-2018 Shift 1 Solved Paper

Question : 6 of 100

Marks: +1, -0

Rahim started a journey 15 minutes late, and as a result, had to drive at a speed of

54 {km} \/ {h}

instead of

45 {km} \/ {h}

to reach his destination on time. What is the distance covered during the course of the journey?

Solution:

t_{2}-t_{1}={15}/{60} {hrs}

Let the total distance is '

D

' and speeds are

S_{1}

and

S_{2}

{D}/{S_{1}}-{D}/{S_{2}}={15}/{60}

⇒ {D}/{45}-{D}/{54}={1}/{4}

⇒ D=67.5 \ { km}

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