NIFT PG 2019 Question Paper with solutions

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Question : 14 of 150

Marks: +1, -0

A car covers its journey at the speed of

80 {km} \/ {h}

in

10 {h}

. If the same distance is to be covered in

4 {h}

, by how much the speed of car will have to increase?

$8 {km} {/} {h}$
$100 {km} {/} {h}$
$120 {km}{/} {h}$
$160 {km}{/} {h}$

Solution:

Initial speed

=80 {km}{/} {h}

Total distance covered

=8 × 10=800 {km}

[ ∵

Distance

=

Speed

\times

Time

]

New speed

=\;{800}/{4} {km}{/}{h}=200 {km} {/}{h}

∴ Increase in speed

=(200-80) {km}{/} {h}=120 {km} {/} {h}

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