ЁЯУв Too many exams? DonтАЩt know which one suits you best? Book Your Free Expert ЁЯСЙ call Now!

    Question

    The ratio of speed of boat in upstream and in Stillwater

    is 1: 3 respectively. The boat takes a total of 10 hours to travel 300 kilometer in downstream and 20 kilometre in upstream is. If speed of a boat in downstream is X kilometer per hour. Then the time taken by it to travel to 288 kilometer in stillwater will be.
    A (0.45x+5) hrs. Correct Answer Incorrect Answer
    B (x-8) hrs. Correct Answer Incorrect Answer
    C (0.6x+9)hrs. Correct Answer Incorrect Answer
    D (0.5x-8)hrs. Correct Answer Incorrect Answer
    E (2.5x-4)hrs. Correct Answer Incorrect Answer

    Solution

    Let the upstream speed and speed of boat in stillwater be a kilometer per hour and 3a kilometer per hour respectively. Therefore the speed of this stream = 2a Kilometer per hour. And downstream speed of the boat = 2a+3a= 5a Kilometer per hour. According to question, (300/5a) +(20/a) = 10 10a = 80 A=8 Therefore, downstream speed of the boat = 5a=40 a = 8 So X = 40. Time taken by boat To travel to 288 kilometre in Stillwater = 288/24 = 12 hours = ( 0.5*40 тАУ 8 ) = ( 0.5x-8) hrs.

    Practice Next
    More Boats and streams Questions

    Relevant for Exams:

    ask-question