Stretch Straight

A car driving on a straight line. She walks with a 13.8 km at 53 km / h, then 21.4 km at 42 km / h?

A car driving on a straight line from the street. It proceeds with 13.8 km to 53 km / h, then 21.4 km at 42 km / h and finally, 39.5 km at 30.7 km / h. What is the car journey average speed during the whole? Answer in units of mi / h.

(13.8/53) x 60 = 15.623. (21.4/42) x 60 = 30.57. (39.5/30.7) x 60 = 77.199. Total time = 123.392 min (123.392/60) = 2.0565 Clock. Total distance = 74.7 miles. (74.7/2.0565) = 36.324 hours miles. Average.

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