Boats and Streams

Boats and Streams

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Aptitude miscellaneous
  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. 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. The speed of a boat in still water is 15 km/hr and the rate of current is 3 km/hr. The distance travelled downstream in 12 minute is ?








  1. View Hint View Answer Discuss in Forum

    Downstream speed = 15 + 3 = 18 km/hr.

    Correct Option: A

    Downstream speed = 15 + 3 = 18 km/hr.
    Required distance = (18 x 12)/60 = 3.6 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

  1. A person rows a kilometre down the stream in 10 minute and upstream in 30 minutes. Find the velocity of the stream ?








  1. View Hint View Answer Discuss in Forum

    Velocity of stream = (downstream velocity - upstream velocity)/2
    = (60/10 - 60/30)/2

    Correct Option: B

    Velocity of stream = (downstream velocity - upstream velocity)/2
    = (60/10 - 60/30)/2
    = 2 km/hr