📢 Too many exams? Don’t know which one suits you best? Book Your Free Expert 👉 call Now!

  • google app store apple app store
  • ✖

      Question

      A boat moves at 40 km/hr downstream and 10 km/hr

      upstream. How long will it take to cover 150 km in still water?
      A 2 hrs Correct Answer Incorrect Answer
      B 8 hrs Correct Answer Incorrect Answer
      C 6 hrs Correct Answer Incorrect Answer
      D 1 hrs Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      ATQ,

      Let the boat’s speed in still water be x km/hr, and current speed be y km/hr. Then: Downstream speed = x + y = 40 ......(1) Upstream speed = x - y = 10 ......(2) Adding (1) and (2): x + y + x - y = 40 + 10 → 2x = 50 → x = 25 km/hr Time to travel 150 km in still water = 150 / 25 = 6 hours

      Practice Next
      ask-question