Question

A boat goes 30 km downstream and 18 km upstream in 6 hours, again it goes 40 downstream and 20 km upstream in 22 3 hours. Find speed of boat

Answer 1

Explanation:

Let the speed of the boat be x km/hr and speed of current be ykm/hr

speed of the boat downstream= (x+y)

speed of the boat upstream = (x-y)

Therefore,

• x+y =30/6 -1
• x-y 18/6. -2

Adding equation (1) and(2), we get

• x+y+(x-y)= 5+3
• 2x =8
• x=4

Substituting the value of hh : x

• 4+y=5
• y=5-4=1

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Answer 2

Explanation:

Let the speed of the boat be x km/hr and speed of current be ykm/hr

speed of the boat downstream= (x+y)

speed of the boat upstream = (x-y)

Therefore,

x+y =30/6 -1

x-y 18/6. -2

Adding equation (1) and(2), we get

x+y+(x-y)= 5+3

2x =8

x=4

Substituting the value of hh : x

4+y=5

y=5-4=1

Hope it helps

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