Steve traveled the first 7 hours of his
journey at 40 mph and the last 9 hours
of his journey at 50 mph. How long is
the whole journey in miles?
-
miles

64

Explanation:

Distance traveled in 2 hours = 2 * 40 = 80 m

Distance traveled in 3 hours = 3 * 80 = 240m

Total distance covered = 240 + 80 = 320m

Total time = 2 + 3 =5 h

Hence avg speed = total distance covered / total time taken

= 320/5 = 64mph

c (diamond),

sio2 (quartz)

frequency, z, and the collision density, z, in carbon dioxide (co2), r 180 pm at 30 °c and 120 kpa