99+ Boats and Streams Problems With Solutions And Explanation

Q:

If a boat goes upstream at a speed of 18 km/hr and comes back the same distance at 30 km/hr. What is the average speed (in km/hr) for the total journey?

A) 22.5	B) 24
C) 20.5	D) 25

Answer & Explanation Answer: A) 22.5

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Q:

If a boat goes a certain distance at 30 km/hr and comes back the same distance at 60 km/hr. What is the average speed (in km/hr) for the total journey?

A) 45	B) 50
C) 40	D) 35

Answer & Explanation Answer: C) 40

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Q:

Mahesh rows to the place 80 km away and back in 20 hours. He finds that he can row 8 km downstream in the same time as 4 km upstream. The speed of the boat in stillwater is

A) 9 kmph	B) 7 kmph
C) 2 kmph	D) 5 kmph

Answer & Explanation Answer: A) 9 kmph

Explanation:

If Mahesh moves 8 km downstream in X hours

Downstream speed = 8/X kmph

upstream speed = 4/X kmph

Now 80/(8/X) + 80/(4/X)=20

X=2/3

downstream Speed = 8/(2/3)= 12 kmph

upstream Speed = 4/(2/3)= 6 kmph

Rate of the stream = (12+6)/2= 9 kmph

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Q:

Ashok can row upstream at 8 kmph and downstream at 12kmph.What is the speed of the stream ?

A) 6 km/hr	B) 3 km/hr
C) 2 km/hr	D) 4.5 km/hr

Answer & Explanation Answer: C) 2 km/hr

Explanation:

If the speed downstream is a kmph and the speedup stream is b kmph then
Speed of the stream = 1/2 x (a–b) kmph
Speed downstream a = 12kmph
Speed upstream b = 8 kmph
Speed of the stream = 1/2 x (a–b) = 1/2 x (12–8)= 4/2 = 2 kmph

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Q:

A boat goes a certain distance at 40 km/hr and comes back the same distance at 24 km/hr. What is the average speed (in km/hr) for the total journey?

A) 32	B) 28
C) 34	D) 30

Answer & Explanation Answer: D) 30

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Q:

If a boat goes upstream at a speed of 24 km/hr and comes back the same distance at 40 km/hr. What is the average speed (in km/hr) for the total journey.

A) 32	B) 30
C) 31	D) 33

Answer & Explanation Answer: B) 30

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Q:

If a boat goes a certain distance at 30 km/h and comes back the same distance at 20 km/hr, what is the average speed (in km/hr) for the total journey?

A) 25	B) 24.5
C) 24	D) 25.5

Answer & Explanation Answer: C) 24

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Q:

A boat moves down stream at the rate of 8km/hr. and upstream at 4Km/hr. The speed of the boat in still waters is:

A) 4.5 km/hr.	B) 5 km/hr.
C) 6 km/hr.	D) 6.4 km/hr.

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