book Maths Puzzle Numerical Ability

A jet plane traveling at 500mph overtakes a propeller plane traveling at 200mph that had a 2h head start. How far from the starting point are the planes? I have the answer in the b

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a truck sprang a leak at the bottom of its radiator..which held 480 ounces of fluid when it started to leak..and started losing radiator fluid at the constant rate of 4 ounces per -2x+y=6
4x-2y=5