B starts 4 minutes after A from the same...

B starts 4 minutes after A from the same point, for a place at a distance of 7 miles from the starting point. A on reaching the destination turns back and walks a mile where he meets B. If A's speed is a mile in 8 minutes then B's speed is a mile in______ minutes.

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KIRAN PUBLICATION-TIME AND DISTANCE-Type -XI

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