NIFT UG 2019 Question Paper with solutions

Question : 9 of 150

Marks: +1, -0

Samir drove at the speed of

45 {\km}/ {\h}

from home to a resort. Returning over the same route, he got stuck in traffic and took an hour longer, also he could drive only at the speed of

40 {km} \/ {h}

. How many kilometers did he drive each way?

Solution:

Let the required distance be

x {km}

.
According to the question,

\;{x}/{40}-\;{x}/{45}=1 ⇒ \;{9 x-8 x}/{360}=1

⇒ \;\; \;{x}/{360}=1 ⇒ x=360 {km}

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