Help! F.1 maths question
Peter and Mary run with speed 1.2m/s and 4 km/h respectively.
If the track is 400m long,how long does Peter take to overlap Mary?
- 9 years agoFavorite Answer
Do such question, normally you set Y be the answer you want to find,
here, i.e., the time take for Peter to overlap Mary (Y in second)
Then form the equation:
(When Peter ran 400m far from Mary, then he overlap)
1.2m/s x Y = 4km/h x Y + 400
resolve all unit to meter
1.2Y = (4000/3600)Y + 400
Y = 4500
So it take 4500 seconds to overlap Mary
(or 75 minutes)
若覺得我幫到你，請到我的 Facebook Page 比個 Like 我，感激！Source(s): 經數樂園 http://ronaldchik.blogspot.com/