+0  
 
0
32
1
avatar

For travel from Washington DC to Baltimore by car, a constant speed of 60 mph was maintained. For the return trip, there was a constant speed of 40 mph. What was the average speed over the whole two-way trip?

 Jun 18, 2022
 #1
avatar
0

When the distance covered going back and forth is the same, then the:

 

Average speed ==Harmonic mean

 

[2 * 40 * 60] / [40 + 60] ==4800 / 100 ==48 mph - the average speed.

 Jun 18, 2022

7 Online Users