| | Question 15

On a river, C is the mid-point between two points A and B on the same bank of the river. A boat can go from A to C and back in 14 hours and from A to B in 20 hours 20 min. How long it would take to go from B to A?
(A) 6 h 40 m
(B) 6 h 50 m
(C) 7 h 20 m
(D) 7 h 40 m


Answer: (D)

Explanation: Time required to travel from A to B = 20 hour 20 min
Time required to travel from A to C = 1/2 (20 h 20 m)
= 10 h 10 m
Given total time from A to C and C to A = 14 h
10 h 10 m + C to A = 14 h
C to A = 3 h 50 m
Time taken from B to A is twice of C to A
then, time taken from B to A =2*(3 h 50 m)=7 h 40 m

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