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


    Question

    A boat can travel 36 km downstream in 2 hours and 24 km

    upstream in 3 hours. Find the speed of the boat in still water and the speed of the stream.
    A 13 km/h and 15 km/h Correct Answer Incorrect Answer
    B 10 km/h and 5 km/h Correct Answer Incorrect Answer
    C 13 km/h and 5 km/h Correct Answer Incorrect Answer
    D 23 km/h and 25 km/h Correct Answer Incorrect Answer

    Solution

    Downstream speed = 36/2 = 18 km/h Upstream speed = 24/3 = 8 km/h Let speed of boat in still water = u, speed of stream = v. u + v = 18 u − v = 8 Add: 2u = 26 ⇒ u = 13 km/h Then v = 18 − 13 = 5 km/h Answer: Boat speed in still water = 13 km/h, stream speed = 5 km/h.

    Practice Next
    ask-question