Class A has 29 pupils and class B has 15 pupils. Both classes sit the same maths test. The mean score for class A is 59. The mean score for both classes is 57. What is the mean score (rounded to 2 DP) in the maths test for class B?

The generic equation of movement for this case is:

 r = v * t + ro

 Where,

 v: speed

 t: time

 ro: initial position

 We write the equation for each cyclist,

 For Cyclist A:

 r = 19 * t + 24.2

 For cyclist B:

 r = 30 * t

 Equating equations we have:

 19 * t + 24.2 = 30 * t

 Clearing t:

 t = 24.2 / (30-19)

 t = 2.2 h

 It will take the second cyclist to catch up to the first cyclist about:

 t = 2.2 h

Step-by-step explanation: