Tipson Cracking Aptitude Questions on Boats & Streams

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1 TIP on cracking Aptitude Questions on Boats and
Streams
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Tip 1 Understand that the water current can
help (when downstream) or hinder (when upstream)
the boat
If Sb, Sc, Su and Sd be the speeds of the boat in
still water, speed of the current in the stream,
speed of the boat while running upstream and
speed of the boat while running downstream
respectively, then Sb Sc  Sd and Sb
Sc Su Question A boat running upstream takes
8 hours 48 minutes to cover a certain distance,
while it takes 4 hours to cover the same distance
running downstream. What is the ratio between the
speed of the boat and speed of the water current
respectively? Solution Let the distance
travelled be d metres Sb Sc d/ 528 metres/
min When travelling upstream Sb Sc d/240
metres/ min When travelling downstream Solving
the equations above, we get Sb Ss 8 3
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