Kiran rows a boat. Going downstream she covers 18 km in 2 hours; going upstream she covers 18 km in 3 hours. Let x be the speed of the boat in still water and y the speed of the stream (both in km/h). Find the speed of the boat downstream (x + y) in km/h.

Question

Accepted Answer

9 km/h. Downstream: x + y = 18/2 = 9 km/h. (Upstream: x - y = 18/3 = 6, giving x = 7.5, y = 1.5.) The downstream speed x + y = 9 km/h.

Kiran rows a boat. Going downstream she covers 18 km in 2 hours; going upstream she covers 18 km in 3 hours.
Let $x$ be the speed of the boat in still water and $y$ the speed of the stream (both in km/h).
Find the speed of the boat downstream $(x + y)$ in km/h.

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More Class 10 Word Problems on Linear Pairs practice

Kiran rows a boat. Going downstream she covers 18 km in 2 hours; going upstream she covers 18 km in 3 hours.Let x be the speed of the boat in still water and y the speed of the stream (both in km/h).Find the speed of the boat downstream (x+y) in km/h.

Step-by-Step Solution

Master this chapter in 30 minutes a day.

More Class 10 Word Problems on Linear Pairs practice

Kiran rows a boat. Going downstream she covers 18 km in 2 hours; going upstream she covers 18 km in 3 hours.
Let $x$ be the speed of the boat in still water and $y$ the speed of the stream (both in km/h).
Find the speed of the boat downstream $(x + y)$ in km/h.