Question
On a river, Q is the midpoint between two points P and R
on the same bank of the river. A boat can go from P to Q and back in 12 hours, and from P to R in 16 hours and 40 min How long would it take to go from R to P. sscSolution
Time required travelled from P to R = 16h +40min PQ=QR          (Q is mid-point) Required time to travel PQ= (16h 40min)/2 =8h 20min Total required time from P to Q +Q to P =12 h 8h20min+Qto P = 12h Q to P = 12h-8h20min=3hour 40min ATQ- QP = RP/2 R to P =2 ×QP Required time R to P = 2×3h 40min =7h 20min =22/3 hours.
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