Multiple choice

The speed of train A is 25 km/h more than the speed of train B. A takes 4 hours less time to travel a distance of 300 km than what train B takes to travel 250 km. what is the speed (in km/h) of A?

  1. 60

  2. 50

  3. 65

  4. 55
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Let speed of B be v. Speed of A is v+25. Time A = 300/(v+25), Time B = 250/v. 250/v - 300/(v+25) = 4. Solving the quadratic equation 4v^2 - 150v - 6250 = 0 gives v=25. Speed of A = 25+25 = 50.

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