Boats and Streams

Boats and Streams

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Aptitude miscellaneous
  1. A man can row upstream 32 km in 4 hours. If the speed of current is 2 km/hr, find how much he can go downstream in 6 hours ?








  1. View Hint View Answer Discuss in Forum

    ∵ Upstream rate = 32/4 = 8 km/hr
    ⇒ Speed of man in still water = 8 + 2 = 10 km/hr
    ⇒ Downstream rate = (10 + 2) = 12 km/hr

    Correct Option: B

    ∵ Upstream rate = 32/4 = 8 km/hr
    ⇒ Speed of man in still water = 8 + 2 = 10 km/hr
    ⇒ Downstream rate = (10 + 2) = 12 km/hr
    Now, the required distance = 12 x 6 = 72 km

  1. A man rows downstream 60 km and upstream 36 km, taking 4 hours each time. The speed of the man is :








  1. View Hint View Answer Discuss in Forum

    Sd = 15 km/h
    Su = 9 km/h
    Speed of man= (Sd + Su)/2

    Correct Option: D

    Sd = 15 km/h
    Su = 9 km/h
    Speed of man= (Sd + Su)/2
    ∴ Speed of man = (15 + 9)/ 2 = 12 km/h

  1. A man can row upstream at 15 km/h and downstream at 21 km/h. The speed of water current of the river is ?








  1. View Hint View Answer Discuss in Forum

    Speed of water current =( Vd - Vu)/2

    Correct Option: C

    Speed of water current =( Vd - Vu)/2
    = (21 - 15) /2
    = 3 km/h

  1. A man can row upstream 36 m in 6 hours. If the speed of a man in still water is 8 km/hr, find how much he can go downstream in 10 hours ?








  1. View Hint View Answer Discuss in Forum

    ∵ Speed of current = 8 - 36/6 = 2 km/hr
    ⇒ Rate downstream = (8 + 2) = 10 km/hr

    Correct Option: D

    ∵ Speed of current = 8 - 36/6 = 2 km/hr
    ⇒ Rate downstream = (8 + 2) = 10 km/hr
    ∴ Required distance = (8 + 2) x 10 = 100 km

  1. The speed of a boat downstream is 15 km/hr and the speed of the stream is 1.5 km/hr. The speed of the boat upstream ?








  1. View Hint View Answer Discuss in Forum

    Speed of boat in still water = 15 - 1.5 = 13.5 km/hr
    Speed of boat in upstream = 13.5 - 1.5 = 12 km/hr

    Correct Option: C

    Speed of boat in still water = 15 - 1.5 = 13.5 km/hr
    Speed of boat in upstream = 13.5 - 1.5 = 12 km/hr