NCHMCT JEE 2021 Question Paper with solutions for online practice

Question : 61 of 200

Marks: +1, -0

Two persons ride towards each other from two places

55 {km}

apart, one riding at

12 {km} \/ {h}

and the other at

10 {km} \/ {h}

.
When will they be

11 {km}

apart?

Solution:

Relative speed of both persons

=12+10=22 {km} \/ {h}

Now, distance between both of them

=55-11=44 {km}

∴

Time, when distance is

11 {km}

between both of them

=\;{\;\text " Total distance "\;}/{\;\text " Relative speed "\;}=\;{44}/{22}=2 {h}

Hence, they will be apart

11 {km}

after

2 {h}

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