A man can row at a speed of 41/2 km/hr in still water. If he takes 2…

Question

A man can row at a speed of 41/2 km/hr in still water. If he takes 2 times as long to row a distance upstream as to row the same distance downstream, then the speed of stream (in km/hr) is-

Accepted Answer

Option B. 1.5. Answer & Solution Answer: Option B Solution: & Speed of man in still water , & x = 9/2km/hr & let speed of stream = y km/h & Downstream speed = 9/2 + y & Upstream speed = 9/2 - y & Accroding to questions, & 2 × Distance 9/2 + y = Distance 9/2 - y & 29/2 + y = 19/2 - y & 2 × 29 +…