exam Maths Puzzle Numerical Ability

harrys motorboat can make an average of 8 miles per hour . one day he sets out for a trip , only to have the motor break down . harry rows back at two miles an hour. When he reaches his dock , he finds that he has been gone 5 hours . how far has he rowed?

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exam Other Question
y=3x
x+2y=-21 Hopeless need help!
express with only positive exponents??????????
a)
x^2-2x-15/x^2-x-6 divide x^2-5x/x^2-4

b)
6/x-1 subtract x+2/x

c)
(x+3)^2-2(x+1)

d)
{3y^2z/x^