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Two cars are travelling along two roads which cross each other at right angles at $A$ . One car is travelling towards A at $21 k m p h$ and the other is travelling towards $A$ at $28 k m p h$ .If initially, their distance from $A$ are $1500 k m$ and $2100 k m$ respectively,then the nearest distance between them is ,

A

30

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B

45

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C

60

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D

75

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Solution

The correct option is C $60$
Nearest distance
$= \frac{2100 - 1500}{10}$
$\frac{600}{10} = 60$

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