Question

An airplane flies 450 km from Raleigh to Washington DC at 500 km hr. It stops for a while in Washington DC and then flies 370 km to New York at 500 km hr. If the average speed for the entire trip from Raleigh to New York is 95 km hr, how long did the plane stop in Washington DC? 7.0 hours 1.6 hours 5.2 hours 2.8 hours 8.6 hours

Answer 1

The average velocity is Total distance Total time 95 450 450 370 500++370 500) 820 0.9+t +0.74 95 Calculate for t. (0.9+t+0.74)95 820 t 6.99 hr