GMAT Problem Solving (PS) | Re: If a car had traveled 20 kmh faster than it actually did, the trip

Time = Distance/Speed

Difference in time = 1/2 hrs

60/x - 60/(x + 20) = 1/2

Substitute the value of x from the options. --> x = 40 --> 60/40 - 60/60 = 3/2 - 1 = 1/2

Answer: B

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