Question

Michael and his sister Jane left their house at the same time going in the opposite direction. Michael drove at an average speed of
40 mph, while Jane drove at an average speed of 35 mph. After how many hours were they 400 miles apart?
Michael's distance --- x
Jan'e distance ---- 400-x

x/40 = (400-x)/35

35x = 16000 - 40x

solve for x, the distance that Michael went

divide x by 40 to get the time,
(check by dividing 400-x by 35, you must get the same answer)
d1 + d2 = 400.
40*T + 35*T = 400,
T = 5 1/3 Hours.

Related Questions

Brenda left the hardware store and drove toward the recycling plant at an average speed of 20mph. Pe... Molly left home and drove toward the ferry office at an average speed of 27 mph. Mark left two hours... Jessica left the mall and drove toward the desert at an average speed of 40 mph. Shreya left one hou... Michael drove 210 miles in 3 and one-half hours. Jordan drove 330 miles in 6 hours. Which is an accu...