# PHYSICS PROBLEM HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!1?

i have this problem and 3 parts to it, it seems really simple but i cant figure it out

here it is, any help is appreciated

You drive on Interstate 10 from San Antonio to Houston, half the time at 57 km/h and the other half at 99 km/h. On the way back you travel half the distance at 57 km/h and the other half at 99 km/h.

i want to find the following

What is your average speed from Houston back to San Antonio?

What is your average speed for the entire trip?

What is your average velocity for the entire trip?

thats all the info given...thanks!

### 1 respuesta

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Respuesta preferida

Let the total time taken to drive one way (going or coming) be 2T

=> Distance covered during half the time at 57 Km/h = T*57

=> Distance covered during half the time at 99 Km/h = T*99

Total distance one way = T*57 + T*99 = 156*T

Average speed from Houston to San Antonio = Distance/Time = 156*T/2*T = 78 km/h

Average speed for entire trip = (156*T + 156*T)/(2*T + 2*T) = 78 Km/h

Average velocity for entire trip = Displacement/time = 0/4T = 0 Km/h

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