RRB Group D 15-Sep-2018 Shift 1 Solved Paper

Question : 76 of 100

Marks: +1, -0

Mahima started a journey 12 minutes late and as a result had to drive

@ 54 {\km} \/ {\hr}

instead of @

45 {\km} \/ {\hr}

to reach on time. Find the distance covered during the course of the journey.

Solution:

\;\text " Let the distance covered be "\; D {km}

\;\text " As "\; t=\;{ {d}}/{ {S}}

\;\text " From question, "\; \;{D}/{45}-\;{D}/{54}=\;{12}/{60}

{D}[\;{54-45}/{45 × 54}]=\;{12}/{60}

{D}=\;{12 × 45 × 54}/{60 × 9}=\;{60 × 54}/{60}

⇒ \;\; {D} \;\; =54 {km}

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