SOLUTION: Help: Alberto left the store 2 hours before Cody. They drove in opposite direction. Cody drove at 20km/h for three hours. After this they were 435 km apart. find Alberto's sp

Question 364904: Help:
Alberto left the store 2 hours before Cody. They drove in opposite direction. Cody drove at 20km/h for three hours. After this they were 435 km apart. find Alberto's speed.
Please help set up the problem for I know it has something too do with RT=D. just can't figure out the 3 hours. test is tomorrow. Much appreciated.
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
Alberto left the store 2 hours before Cody. They drove in opposite direction. Cody drove at 20km/h for three hours. After this they were 435 km apart. find Alberto's speed.
...
Cody 's speed = 20 mph
cody time = 3hours
D= rt
Cody D= 3*20 = 60 miles.
..
they were 435 miles away.
435-60= 375 miles.
...
alberto drove 375 miles in 2+3 = 5 hours
Alberto s=d/t
s= 375/5
s= 75 mph. Alberto's speed.
...
m.ananth@hotmail.ca
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