<PRE><B>Question 814880</B>
Train A leaves the station traveling 20 m/h heading east.2 hours later train B leaves the same train traveling west at 35m/h.How long will it take for the two trains to be 205 miles away from each other?


in 2 hours train A has traveled 2*20 = 40 miles

when train B starts they are 40 miles apart

actual distance when both are moving = 205-40=165 miles

they are moving away from each other
add up their speeds

35+20 = 55 mph
D= 165 miles
t=d/r

=165/55
=3 hours

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