Question

Can someone teach me how to solve this Refer to this table of results of the Indianapolis 500 in which drivers competed in the 500-mile race. To the nearest mile per hour, how much faster was the average winning speed in 2004 than in 1911? (Enter only the number.) Picture included

Answer 1

speed = distance over time
speed in 2004 : I am changing time to seconds ...3 hr and 15 s = 3600(3) + 15 = 10800 + 15 = 10815
s = 500/10815 .....s = .0462/sec
thats per second, per hour would be .0462 x 3600 = 166.32/hour

speed in 1911 : changing time to seconds. 6 hours 42 min = 3600(6) + 42(60) = 21600 + 2520 = 24120 s
s = 500/24120 = .0207/sec
per hour, that would be .0207 x 3600 = 74.52/hr

2004 speed = 166.32
1911 speed = 74.52
-------------------subtract
2004 is 91.8 miles faster

Answer 2

Thank you so much

Answer 3

you might want to get a second opinion

Answer 4

I can agree with @texaschic101 's work. :)
The speeds found might be a bit different depending on rounding, although the final answer was still what I got. :)