Speed of a boat in still water is 18 km hr Speed of the boat in Downstream is 6 km hr more than its ...........

Quantitative Aptitude(IBPS CL) Boats and Streams

Speed of a boat in still water is 18 km/hr. Speed of the boat in Downstream is 6 km/hr more than its speed in upstream. How much distance in Downstream boat will cover in 5 hours 20 min?

112 km

108 km

98 km

116 km

None of these

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Explanation:

Let the speed of river be x km/h.
According to question,
(18 + x) − (18 − x) = 6
⇒ 2x = 6
⇒ x = 3
Downstream speed of boat = 18 + 3 = 21 km/hr
5 hours 20 min = 5(1/3)=16/3 hr
Required distance = 21 ×16/3 = 112 km