A ship 156 km away from the shore springs a leak which admits 7/3 tons of water in 6.5 min. A pump throws out water at the rate of 15 tons in 1 hour. If 68 tons of water can sink the ship, find the lowest average speed just enough to reach the shore.

(a) 20 kmph
(b) 15 kmph
(c) 10 kmph
(d) 25 kmph

• b) 15 kmph
  Water filling per hour=(7/3)*60/6.5=280/13 Tons
  water thrown @ 15 tons in 1 hour,
  Actual water storing/hr=280/13 -15=85/13 Tons
  To store maximum 68 tons of water time required=68*13/85=884/85=10.4 Hr.
  So Speed required to cover distance of 156 km= 156/10.4= 15 km/hr
  
  
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