1.

A boy rows downstream, covers some distance, and then comes back upstream in 8 hours. Calculate the distance covered if the speed of the boat in still water is 6 kmph and the speed of the stream is 4 kmph.1. 40 km2. 40/7 km3. 40/3 km4. 18 km

Answer» Correct Answer - Option 3 : 40/3 km

Given:

Speed of boat in still water = 6 kmph

Speed of stream = 4 kmph

U/S + D/S = 8 hours

Formula used:

Speed of boat in still water is a kmph and speed of stream is b kmph

Speed D/S = (a + b) kmph

Speed U/S = (a – b) kmph

Calculations:

Speed in still water = 6 kmph

Speed of stream = 4 kmph

⇒ DS speed = 10 kmph

⇒ US speed = 2 kmph

Assume distance to be D km

⇒ (D / 10) + (D / 2) = 8

⇒ 6D/10 = 8

⇒ D = 40/3 kms

Distance covered is 40/3 kms



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