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.
A met B on his return after covering 7 milesÂ
so A covered a total of 8 miles
Now speed of A =1/8 mile/min
8 miles A will cover in 64 minutes
Now B has covered 7-1 =6miles in 64-4 =60 minutes
so Speed of B = 6/60 = 1/10 mile/min
so B covers 1 mile in 10 minutes
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