Physics
posted by Kristina .
A golfer rides in a golf cart at an average speed of 3.10 m/s for 21.0 s. She then gets out of the cart and starts walking at an average speed of 1.60 m/s. For how long (in seconds) must she walk if her average speed for the entire trip, riding and walking, is 2.10 m/s?
I need help solving for T. I don't understand how to do it since there is a T on both sides of the problem

Hmmmm. Are you certain you want to take physics? Here is an example:
a*T+ 19= b*T  24
subtract b*T from both sides...
a*Tb*T+19=24
subtract 19 from both sides..
T(ab)=2419
then
T= 43/(ab)
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