Question

A man rows downstream at 20 km/hr and rows upstream at 15 km/hr. At what speed he can row in still water?
O 17.5 km/hr
O 18 km/hr
0 20.5 km/hr
O 22 km/hr
SUBMIT​

Answer 1

Answer:

17.5

Step-by-step explanation:

x+y = 20

x-y = 15

2x = 35

x = 17.5

Answer 2

Answer:

speed of the boat in still water is 17.5km/h

Step-by-step explanation:

given that:

downstream speed = 20km/h

upstream speed = 15km/h

we know that :

Upstream = (u−v) km/hr, where “u” is the rate of the boat in nevertheless water and “v” is the rate of the stream

Downstream = (u+v)Km/hr, where “u” is the rate of the boat in nevertheless water and “v” is the rate of the stream

Speed of Boat in Still Water = ½ (Downstream Speed + Upstream Speed)

therefore,

speed of the boat in still water = 1/2 (20 + 15)

                                             = 35/2  = 17.5km/h

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