1.

If a man rows at the rate of 10 km/h in still water and his rate against the current is 4 km/h. then the man's rate along the current is:1. 15 km/h2. 20 km/h3. 10 km/h4. 16 km/h5. 24 km/h

Answer» Correct Answer - Option 4 : 16 km/h

Given:

Upstream rate = 4 km/h

Speed of a man in still water = 10 km/h

Formula Used:

Speed of the man (boat) in still water = ½ [DOWNSTREAM rate + UPSTREAM rate]

Calculations:

Let the downstream rate be x kmph

According to the formula,

Speed of the man (boat) in still water = ½ [DOWNSTREAM rate + UPSTREAM rate]

⇒ 10 = (1/2) (x + 4)

⇒ 20 = x + 4

⇒ x = 20 – 4

⇒ x = 16 km/h

The man's rate along the current is 16 km/h.


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