Question

You drive 46 km at 37 km/h and then another 46 km at 116 km/h . Your average speed over the 92.0 km drive will be

Answer 1

You drive d1= 46km at S1= 37 km/h in time T1

And again you drive

d2= 46 km at S2= 116 km/h in time T2

Let the average speed is V over d1+d2=92 km means for total distance .

Average speed =( total distance) / (total time)

Total distance = d1 + d2 = 92 km

Total time = T1 + T2

Total time = 1.6397 hour

Now the average speed is V

V = total distance / total time

V = 92 /1.6397

V = 56.105 km/h

This is the average speed.

You can also solve by direct formula

V = (2*S1*S2)/(S1 + S2 )

V = (2*37*116)/(37+116)

V = 56.104 km/h