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samy_dg · 2005 June 13th, 05:31 AM

2. A and B take part in a 100m race. A runs at 5 Km/hr. A gives B a start of 8m and still beats him by 8 seconds. The speed of B is:
A takes 1 hr to go 5000m
So, A takes 100/5000hr=.02hr=.02X3600sec=72sec to go 100m
So, B takes (72+8) sec to go 100-8=92m
So, Speed of B=92/80 m/s
= (23/20)X(3600/1000)km/hr
= 1.15X3.6km/hr
= 4.14 km/hr...........................(Answer=B)

2005 June 13th, 05:31 AM	#3 (permalink)
samy_dg Somebody Stop Me !! Join Date: May 2005 Location: Waterloo, ON, Canada Posts: 1,220	Re: Race problems from practice tests 2. A and B take part in a 100m race. A runs at 5 Km/hr. A gives B a start of 8m and still beats him by 8 seconds. The speed of B is: A takes 1 hr to go 5000m So, A takes 100/5000hr=.02hr=.02X3600sec=72sec to go 100m So, B takes (72+8) sec to go 100-8=92m So, Speed of B=92/80 m/s = (23/20)X(3600/1000)km/hr = 1.15X3.6km/hr = 4.14 km/hr...........................(Answer=B) _ _ _ _ SIG _ _ _ _ Nothing's impossible. ______________________________________