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Delhi is at a distance of 200 km from A...

Delhi is at a distance of ` 200 km` from Ambla. (A) sets out from Ambala at a speed of ` 30 km h^(-1)` and (B) sets out at the same time from Delhi at a speed fo `20 k h^(-1)` . They will meet each other after a tiem of .

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The correct Answer is:
(c )
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