1.

The speed of a boat in still water is 30 km/h and speed of stream is 6 km/h. What is the time taken by the boat in minutes to cover a distance of 12 km downstream?1. 182. 203. 254. 30

Answer» Correct Answer - Option 2 : 20

Given-

Speed of a boat in still water = 30 km/h

Speed of stream = 6 km/h

Formula Used- 

Distance = Speed × Time

Concept Used- 

Relative Downstream Speed = Speed of a boat in still water + Speed of stream

Calculation-

Relative Downstream Speed = 30 + 6

⇒ 36 km/hr

Time taken = 12/36 hr

⇒ (1/3) × 60 minutes

⇒ 20 minutes

∴ Time taken by the boat to cover a distance of 12 km downstream is 20 minutes.



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