SOLUTION: Anna left the science museum and drove south. Gina left three hours later driving 42 km/h faster in effort to catch Anna. After 2 hours, Gina caught up with Anna. What was Gina'

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Question 1092370: Anna left the science museum and drove south. Gina left three hours later driving 42 km/h faster in effort to catch Anna. After 2 hours, Gina caught up with Anna. What was Gina's average speed as she tried to catch Anna? Just give the numerical answer for Gina's speed.
Answer by ikleyn(52898) About Me  (Show Source):
You can put this solution on YOUR website!
.
Since you ask for numerical answer only, I give the solution in the shortest form:

Gina's average speed = %282%2A42%29%2F3 = 2*14 = 28 km/h.

Answer. Gina's average speed is 28 km/h.

There is the lesson on solving catching-up problems
    - Travel and Distance problems for two bodies moving in the same direction (catching up)
in this site.