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A man can row 6 kmph in still water. When the river is running at 1.2 kmph, it takes him 1 hour to row to a place and black. How far is the place?

Correct answer: B. 2.88 km

  • A. 3.12 km
  • B. 2.88 km
  • C. 3 km
  • D. 2 km

Explanation

The downstream and upstream speeds are 7.2 km/hr and 4.8 km/hr. For one-way distance d km, d/(7.2 km/hr) + d/(4.8 km/hr) = 1 hour, so d(1/7.2 + 1/4.8) = 1 hour and d = 2.88 km. The likely mistake is option c, 3 km, which is only a rough estimate and does not satisfy the exact one-hour round-trip equation.

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