Two boats start from opposite banks of river perpendicular to the shore. One is fasterthen the other. They meet at 720 yards from one of the ends. After reaching opposite endsthey rest for 10mins each. After that they start back. This time on the return journey theymeet at 400yards from the other end of the river. Calculate the width of the river.

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bhavukchawla

  • Aug 20th, 2006
 

Let us assume that width of river d yards and speed of boats - x and y yards/min respectively.Hence the two equations are :1) (d-720)/x = 720/y2) (d/y+10+400/y) = (d/x + 10 + (d-400)/x)Solving the two equationsWe get d=1760 yards

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