SSC CGL 23 Aug 2021 Shift 2 Paper

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Question : 66 of 100

Marks: +1, -0

A car can cover a distance of

144 {km}

in

1.8 {h}

. In what time (in hours) will it cover double the distance when its speed is increased by

20 \%

?

3
$2.5$
2
$3.2$

Solution:

Given, Distance

=144 {km}

,
Time

=1.8 {h}

We know that,

\;\text " Speed "\; \;\; =\;{\;\text " Distance "\;}/{\;\text " Time "\;}

\;\; =\;{144}/{1.8}=\;{1440}/{18}=80 {km} \/ {h}

Now, speed increases by

20 \%

\;\;\; =80 × \;{120}/{100}=96 {km} \/ {h}

\;\text " and distance "\;=2 × 144=288 {km}

∴ \;\; \;\text " Time "\;=\;{\;\text " Distance "\;}/{\;\text " New Speed "\;}

⇒ \;\; \;\text " Time "\;=\;{288}/{96}=3 {h}

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