Question
If a boat travels 35 km more in downstream than in
upstream in 5 hr and if the speed of the boat in still water is 25 km/hr, then find the distance travelled by boat in downstream in 4 hr?Solution
S is the speed of boat in still water = 25 km/hr
Speed of upstream = 25 + x
Speed in downstream = 25 - x
Distance in downstream - distance in upstream =35 km {given}
According to question,
(25 + x) times; 5 - (25 - x) times; 5 = 35
(25 + x) - (25 - x) = 7
2x = 7
x = 3.5 km/hr
Distance in downstream in 4 hr
D = (25 + 3.5) times; 4
D = 28.5 times; 4
D = 114 km
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