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plss.. help me with this question

 
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jeffrey01



Joined: 04 Jan 2011
Posts: 1
Location: philippines, caloocan city
PostPosted: Wed Jan 05, 2011 8:06 am    Post subject: plss.. help me with this question Reply with quote
plsss. help me with this question I need an answer until this 8:00 p.m

julio and lito start at the same time from two towns 90km. apart traveling towards each other, julio's rate is five km faster than lito's. they met after two hours. find the average speed of each.
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hepcj
Site Admin


Joined: 23 Jun 2007
Posts: 121
PostPosted: Wed Jan 05, 2011 10:06 pm    Post subject: Reply with quote
It's your lucky day.
We know the distance d = 90 km
and the speed of each
one is 5 km/hr faster i.e. v + 5
-v

the time taken is 2 hrs
t = 2

keeping everything in km/hr, km and hrs.

d - (v+5) t = v t
90 - 2v - 10 = 2v
80 = 4v
v = 80/4 = 20 km/hr

v + 5 = 25 km/hr
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