SOLUTION: [Nancy left London traveling at 40 MPH. Tom to catch up left some time later driving at 49 MPH Tom caught up after 4 hours how long was Nancy driving before Tom caught up?]

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Question 809929: [Nancy left London traveling at 40 MPH. Tom to catch up left some time later driving at 49 MPH Tom caught up after 4 hours how long was Nancy driving before Tom caught up?]
Answer by TimothyLamb(4379) About Me  (Show Source):
You can put this solution on YOUR website!
Question:
[Nancy left London traveling at 40 MPH. Tom to catch up left some time later driving at 49 MPH Tom caught up after 4 hours how long was Nancy driving before Tom caught up?]
---
s = d / t
t = d / s
d = s * t
---
D = 40n = 49t
D = 40n = 49*4
---
40n = 49*4
40n = 196
Answer:
n = 4.9 hours
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