8 in 2.408 is closer to 10, so you round 2.408 to 2.41
6x-12
Combine 2x and 4x = 6x
Combine -17 and 5 = -12
the rate given is 345 ft/min
this means within 1 min distance is - 345 ft
we have to convert this speed to ft/h
1 hour is equivalent to 60 minutes
so if 60 minutes equals 1 hour
1 minute is equal to - 1/60 hr
so the distance within 1 minute is - 345 ft
since 1 min = 1/60 hr
distance within 1/60 hour = 345 ft
therefore distance in 1 hour = 
answer is 20 700 ft/h
This is 90,000 is your answer