Speed of boat is 600% of the speed of the stream. If he takes 4 hrs to cover 120 km.Then find the distance travelled by boat in 2 hrs upstream.
(a)45
(b)50
(c)55
(d)65
Answers
may be 65
actually the answer is 6km may be
not sure about the answer
The distance traveled by boat in 2 hrs upstream is 50 km
Given:
Speed of boat = 600% * speed of the stream
it takes 4hours to cover 120 km in still water.
To find:
distance traveled by boat in 2 hrs upstream
solution:
let the speed of the stream be x
then, the speed of the boat is = x* 600/100 =6x
speed of the boat upstream = 6x - x = 5x
it takes 4hours to cover 120 km in still water
speed * time = distance
speed of stream= x
we have, speed of boat =6x
and, 6x * 4 =120 km
so, the speed of the stream (x) = 120/24=5 km/hr
and, speed of the boat is = 6x= 6*5 = 30 km/hr
distance traveled by boat upstream in 2 hours = speed of boat upstream * time
= 35 km/ hr * 2hr = 50 km
therefore, The distance traveled by boat in 2 hrs upstream is 50 km
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