Question

A boat goes 32 km upstream and 36 km downstream in 7 hours. In t hours, it can go 40 km upstream and 48 km downstream. If x represents the speed of the boat in still water in km/hr and y represents the speed of the stream in km/hr, then ......

(A) x + y = 12, x - y = 6

(B) x + y = 5, x - y = 11

(C) x + y = 6, x - y = 10

(D) x + y = 10, x - y = 6

Answer 1

A boat goes 32 km upstream and 36 km downstream in 7 hours. In t hours, it can go 40 km upstream and 48 km downstream. If x represents the speed of the boat in still water in km/hr and y represents the speed of the stream in km/hr, then x + y = 12, x - y = 6.