exam Maths Puzzle Numerical Ability

(1/x+h+3)- (1/x+3)
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Could use some hlp plz

find the leading coefficient of (5x-2)(4-9x)(4x+5)^2(5-2x)^3

thanks a million 4 your time A slow train leaves the station, 2 hrs later a fast train, with double the speed of the slow train, leaves the station and catches up with the slow train after traveling 180 mi. Find the speed of both trains.