Practicing Success
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.. |
323 km 437 km 399 km 441 km |
437 km |
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 |