Answer: Answer is D.
Step-by-step explanation:
The two trains will meet when the sum of the distances covered by the two trains is 504 miles.
distance = speed x time.
Let the time covered when they meet be x, then:
80x + 100x = 504
180x = 504
x = 504/180 = 2.8.
Therefore, the two trains will meet in 2 hours 48 mins.
The primes are 2, 3, 5, 7, 11, 13, 17, 19. There are 8 of them, so they make up 40% of the numbers 1–20.
62=0.905•w
Solve the equation for w
