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anonymous
 5 years ago
train traveling north @ 60mph. one hour later, another train leaves @ 70mph. how far away before second train catches up? t
anonymous
 5 years ago
train traveling north @ 60mph. one hour later, another train leaves @ 70mph. how far away before second train catches up? t

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anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0right so this is a bit harder to parse

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0so basically the second train has caught up once the distances they've traveled are exactly equal

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0ok so in one hour, once the second train leaves, the first train has a 60mph*1hr head start

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0so it's gone exactly 60 miles already

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0so from that point on, we're basically solving for some time T

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.070*T  60*T = 60 (the head start being 60mph)

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0or in time T, when they have traveled the same distance, we know that 70*T = 60 + 60T

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0so 70T  60T = 60 = 10T

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0In six hours, they would have traveled the same distance

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0so now let's check this:

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0In 6 hours from the original 1 hour, the first train has traveled 7hours

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0so it's traveled 7 hours * 60mp/h = 420 miles

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0the second train has traveled 6 hours total. so 6 hours * 70mph = 420miles

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0which is exactly the point the second train passes the first
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