A watercraft goes downstream from one point to another in 19 hours. It covers the same distance upstream in 23 hours. If the speed of the stream is 2 km/hr, then find the distance between the two points..
Answer & explanation
Correct answer: option 2
Downstream (D.S) : Upstream (U.S)
Time 19 : 23
Speed 23 : 19
Then the ratio of speed of boat and stream = \(\frac{23 + 19}{2}\) : \(\frac{23 - 19}{2}\)
= 21 : 2
2R = 2 kmph
R = 1
Then D.S and U.S speed = 23, 19
Distance = speed × time
= 23 × 19
= 437 km