A man can row at the speed of 11 kmph in still water. The stream is ru

1.	A man can row at the speed of 11 kmph in still water. The stream is running at the speed of 2 kmph. If the distance between two places is 117 km then find how long will he take to travel upstream and downstream.1. 9 hours2. 13 hours3. 18 hours4. 22 hours
Answer» Correct Answer - Option 4 : 22 hours Given: Speed of boat in still water = 11 kmph Speed of stream = 2 kmph Distance = 117 km Formula used: Downstream speed = Speed of boat + Speed of stream Upstream speed = Speed of boat – Speed of stream Speed = Distance/Time Calculations: Let the downstream speed and upstream speed be d and u respectively Downstream speed ⇒ d = 11 + 2 = 13 kmph Upstream speed ⇒ u = 11 – 2 = 9 kmph Time taken in going upstream and downstream ⇒ (117/9) + (117/13) ⇒ 13 + 9 ⇒ 22 hours ∴ The man will go upstream and downstream in 22 hours

A man can row at the speed of 11 kmph in still water. The stream is running at the speed of 2 kmph. If the distance between two places is 117 km then find how long will he take to travel upstream and downstream.1. 9 hours2. 13 hours3. 18 hours4. 22 hours

Answer» Correct Answer - Option 4 : 22 hours

Given:

Speed of boat in still water = 11 kmph

Speed of stream = 2 kmph

Distance = 117 km

Formula used:

Downstream speed = Speed of boat + Speed of stream

Upstream speed = Speed of boat – Speed of stream

Speed = Distance/Time

Calculations:

Let the downstream speed and upstream speed be d and u respectively

Downstream speed

⇒ d = 11 + 2 = 13 kmph

Upstream speed

⇒ u = 11 – 2 = 9 kmph

Time taken in going upstream and downstream

⇒ (117/9) + (117/13)

⇒ 13 + 9

⇒ 22 hours

∴ The man will go upstream and downstream in 22 hours

Discussion

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