The ratio of the speed of a boat is that of the current of water as 36:5. The boat goes along with the current in 2 hours 35 minutes. It will come back in?
Answer & explanation
Correct answer: option 3
ATQ, Boat speed(x) : Current speed(y)
36 : 5
Then, to calculate the ratio of downstream to upstream, i.e.
Downstream = (x + y)
Upsteeam = (x - y)
(D.S) Downstream : (U.S) upstream
36 + 5 : 36 - 5
Speed 41 : 31
Time 31 : 41 (reverse of speed, since distance is same)
5x ↓ ↓ x5
(given) 155 min 205 min