exam Maths Puzzle Numerical Ability

Solve each equation.

5y^2-25y=0

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exam Other Question

Two stations that are 2 miles apart receive a sound signal issued from a source located at point P(x,y). The station located at point (0,-1) gets the signal 4 seconds earlier than what is the definition for a pair of straight lines ? can we give it in terms of eccentricity?