Multiple choice

Speeds of a boat along the current and against the current are 16 km/hr and 12 km/hr respectively. What is the speed (in km/hr) of the current? धारा के साथ और धारा के विरूद्ध एक नाव की गति क्रमशः 16 किमी / घंटा और 12 किमी / घंटा है। धारा की गति (किमी / घंटा में) क्या है?

  1. 1

  2. 2

  3. 3

  4. 4
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B Correct answer
Explanation

Speed downstream = Boat + Current = 16 km/hr. Speed upstream = Boat - Current = 12 km/hr. Adding: (Boat + Current) + (Boat - Current) = 2 × Boat = 28, so Boat = 14. Subtracting: 16 - 12 = 4 = 2 × Current, so Current = 2 km/hr. Current speed is half the difference.

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