📢 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

    Speed of a boat in still water is 3 times more than the

    speed of stream. If boat covers 135 km in downstream in 9 hours, then find the time taken by the boat to cover 108 km in upstream.
    A 12 hours Correct Answer Incorrect Answer
    B 11 hours Correct Answer Incorrect Answer
    C 8 hours Correct Answer Incorrect Answer
    D 9 hours Correct Answer Incorrect Answer
    E 7 hours Correct Answer Incorrect Answer

    Solution

    Let the speed of stream be ‘x’ km/hr. So, speed of boat in still water = 4 × x = 4x km/hr Downstream speed of boat = 4x + x = 5x km/hr According to question; 5x = 135/9 = 15 Or, x = 3 Upstream speed of the boat = 4x – x = 3x = 3 × 3 = 9 km/hr Required time taken = 108/9 = 12 hours

    Practice Next
    More Boats and streams Questions

    Relevant for Exams:

    ask-question