1. The problem statement, all variables and given/known data A car travels up a hill at a constant speed of 32 km/h and returns down the hill at a constant speed of 66 km/h. Calculate the average speed (in km/h) for the round trip. 2. Relevant equations average speed= total distance/ delta time is the only equation i know for it 3. The attempt at a solution there is no time, or actual distance given in this question, so i got confused and just tried to find the average from adding up the two speeds.. obviously that didn't work- this seems like a really simple problem, so where am i going wrong?