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jeffrey01

Joined: 04 Jan 2011
Posts: 1
Location: philippines, caloocan city

 Posted: Wed Jan 05, 2011 8:06 am    Post subject: plss.. help me with this question 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.
hepcj

Joined: 23 Jun 2007
Posts: 125

 Posted: Wed Jan 05, 2011 10:06 pm    Post subject: 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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