SOLUTION: Carly is training by running to a post across a field and then back. She runs the outward leg at 7m/s and the return leg at 5m/s. She takes 15.4seconds. Find the distance to the po

Algebra ->  Equations -> SOLUTION: Carly is training by running to a post across a field and then back. She runs the outward leg at 7m/s and the return leg at 5m/s. She takes 15.4seconds. Find the distance to the po      Log On


   

Question 204438This question is from textbook Longman Mathematics for IGCSE Book1
: Carly is training by running to a post across a field and then back. She runs the outward leg at 7m/s and the return leg at 5m/s. She takes 15.4seconds. Find the distance to the post. This question is from textbook Longman Mathematics for IGCSE Book1

Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
Carly is training by running to a post across a field and then back. She runs the outward leg at 7m/s and the return leg at 5m/s. She takes 15.4seconds. Find the distance to the post.
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d = rt
t = d/r
15.4 = d/7 + d/5
15.4 = (5d + 7d)/35
12d = 35*15.4 = 539
d = 539/12 m (almost 45 meters)