Answer:
2.8 hours
Step-by-step explanation:
Distance = rate * time
If the west-bound train travels at a rate of 80 mph for t hours, then the distance it travels is 80t.
If the east-bound train travels at a rate of 90 mph for t hours, then the distance it travels is 90t.
The distance between the trains after t hours is 476; therefore, the distance of the west-bound train plus the distance of the east-bound train equals the total distance between them, 476:
80t + 90t = 476 and
170t = 476 so
t = 2.8 hours
28 / 7 = 4
3 x 4 = 12
It’ll take him 12 minutes
540 ft^2 because 90x6=540 2 yards = 6 feet
Answer:
None
Step-by-step explanation:
For option A
3-2r/4=10 and combining like terms and re-arranging we obtain
-2r/4=10-3
-2r/4=7
r=7*4/-2=-14
For option B
3/4-2r=10 then combining like terms and re-arranging
-2r=10-3/4
-2r=9 1/4
r=(9 1/4)/-2=-4.625
For option C
3(r-4)=10 dividing both sides by three first
r-4=10/3
r=10/3+4= 7 1/3
For option D
3-r/4=10
-r/4=10-3
-r/4=7
r=7*-4=-28
Therefore, none of the options yields r=-17
