we've got 50, four-hundred pound men here...?

Question

if there are 50, four-hundred pound men, traveling in a 1968 bus going at 150 miles per hour, and after 20 miles, the bus suddenly stops for 1 minute to pick up 25 more, 400 men, what is the average speed of the bus over a 100 course???

Answer 1

Without the stop they went 100 miles at 150 mph.

t = 100 / 150
t = 2/3 hour = 40 minutes.

But they stopped for 1 minute, that makes 41 minutes or 41/60 hours.

Determining their average bus speed over the 100 miles:
100 miles = r * 41/60
r = 100 * 60/41
r ≈ 146.341463 mph

Answer 2

distance travelled=100 miles?
time taken=20/150+1/60+80/150
=40/300+5/300+160/300
=205/300
average speed=100/(205/300)
=100*300/205 mph=146.34 mph

Answer 3

146.3 miles per hour