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A boy moves 400m towards north 300m towards west and again 400m towards south calculate displacement of the boy from initial position

Substituting the four numbers 1, 9, 8 and 3, for the four letters in the addition problems (different number for different letters) BAD + MAD + DAM. Find the largest sum!

Calculate the rate of flow of glycerine of density 1.25×103kgm−3 through the conical section of a pipe, if the radii of its ends are0.1 m and 0.04 m and the pressure drop across its length is 10Nm−2

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