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

    Question

    The speed of a boat in still water is 28 km/hr. If the

    boat covers 140 km in upstream in 7 hours, then find the time taken by the boat to travel 144 km in downstream.
    A 3 hours Correct Answer Incorrect Answer
    B 2.5 hours Correct Answer Incorrect Answer
    C 4 hours Correct Answer Incorrect Answer
    D 3.5 hours Correct Answer Incorrect Answer

    Solution

    Let the speed of the boat in still water and the speed of the current be ‘x’ km/hr and ‘y’ km/hr, respectively Upstream speed of the boat = (x – y) = 140/7 = 20 km/hr Or, 28 – y = 20 Or, y = 28 – 20 = 8 km/hr Therefore, downstream speed of the boat = 28 + 8 = 36 km/hr Required time taken = 144/36 = 4 hours

    Practice Next
    More Boats and streams Questions

    Relevant for Exams:

    ask-question