Mark drove at a certain speed of 65 km/h for 3 hours and 73 km/h for 2 hours. What was his average speed for the whole journey?

Mark drove at a certain speed of 65 km/h for 3 hours and 73 km/h for 2 hours. What was his average speed for the whole journey?

Mark drove at a certain speed of 65 km/h for 3 hours and 73 km/h for 2 hours. What was his average speed for the whole journey?

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Feb 7, 2018

Answer:

Mark's average speed for the whole journey was #68.2 "km/h"#

Explanation:

These are Mark's times and speeds: Calculate each distance:

3 hours @ 65 km/h . . . .195 km
2 hours @ 73 km/h . . . .146 km
..................................................................
5 hours . . . . . . . . . . . . . . 341 km

#341  "km in " 5  "hours"#

#(341  "km")/(5  "h")#  is an average speed of #68.2  "km/h"#

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