Answered Questions

  • Jul 16 2008
    07:33 PM
    5497
    6

    Power cable question
    • abhijit_de2000

    A power cable is to be run from a power plant on the bank of a river 900 meters wide to a factory that is located 3000 meters downstream on the opposite bank. If the cost of laying cable under water is Rs. 5 per meter and that of laying overhead on land is Rs. 4 per meter, find the point downstream where the cable is to cut across the river.

    agkjack

    • Nov 17th, 2009

    I do not think it is complex. They give cost to plant the cable in ground and water both also
    Let assume the length across the river is x;By given cost 5x=4*3000+5*900so x=3300 3300/2=1650so the point is 1650m from x axis, and 450m(half of distance bet banks) from y axis(450,1650)