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

    âš¡ Month End Offer - Flat 52% Off On All Courses! Enroll Now âš¡
    00:00:00 AM Left

    Question

    The speed of a boat in still water is 20 km/hr. If the

    boat covers 90 km in upstream in 9 hours, then find the time taken by the boat to travel 150 km in downstream.
    A 5 hours Correct Answer Incorrect Answer
    B 4 hours Correct Answer Incorrect Answer
    C 4.5 hours Correct Answer Incorrect Answer
    D 3 hours Correct Answer Incorrect Answer
    E None of these 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) = 90/9 = 10 km/hr Or, 20 – y = 10 Or, y = 20 – 10 = 10 km/hr Therefore, downstream speed of the boat = 20 + 10 = 30 km/hr Required time taken = 150/30 = 5 hours

    Practice Next
    More Boats and streams Questions

    Relevant for Exams:

    ask-question