📢 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

    A boat takes 3 hours 45 minutes to cover 67.5 km in

    downstream. The ratio of the speed of the boat in still water to the speed of the stream is 5:1. Find the speed of the boat while going upstream.
    A 12 km/h Correct Answer Incorrect Answer
    B 18 km/h Correct Answer Incorrect Answer
    C 24 km/h Correct Answer Incorrect Answer
    D 32 km/h Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    ATQ, Speed of boat in downstream = 67.5 ÷ 3.75 = 18 km/h
    Let speed of boat in still water and speed of stream be 5x km/h and x km/h
    Ratio of downstream to upstream = (5x + x)/(5x – x) = 6x/4x = 3:2
    Therefore, speed upstream = (18 × 2)/3 = 12 km/h

    Practice Next

    Relevant for Exams:

    ask-question