exam Maths Puzzle Numerical Ability

a)Write the general quadratic equation._________________
b) the Quotient Rule for Square Roots stares:_____________________
c)circle the correct answer: simplifying a radical pro

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exam Other Question
Over a distance of 120 km, the average speed of a train is 40km/h faster than that of a car. If the train covers the distance in 30min less time, find its average speed.

an equation for this pls?

thanks =D I need help solving a/2 + 1/5=17