book Maths Puzzle Numerical Ability

Lisa had a 20-kilometer start on Jeanette. How long will it take Jeanette to catch Lisa if Lisa travels at 70 kilometers per hour and Jeanette travels at 150 kilometers per hour?

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book Other Question
Evaluate if a=3and b=5
37+a 1 Eliminate, x,y between the following equations
x^2-y^2=px-qy, 4xy=qx+py , x^2+y^2=1

2. Eliminate, x,y,z between equations
y/z - z/y = a , z/x -x/z = b , x/y - y/x =c