Downstream speed of a boat is 16 km /hr. Speed of stream is 40% less than the speed of boat. Find the speed of boat?

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  1. 11 km /h
  2. 10 km /h
  3. 12 km/h
  4. 18 km/h
  5. 9  km /h

Answer (Detailed Solution Below)

Option 2 : 10 km /h
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Detailed Solution

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Calculation

Let speed of boat = x km/h.

Then, speed of stream = x − 0.4x = 0.6x

Downstream speed = boat + stream 

⇒ x + 0.6x = 1.6x

Given 1.6x = 16.

Thus,

⇒ x = 16/ 1.6 ​= 10 km/h 

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