Distance travelled

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getso: Master | Next Rank: 500 Posts; Posts: 141; Joined: Sat Feb 28, 2009 8:19 am; Thanked: 1 times

by getso » Mon Aug 17, 2009 7:50 pm

Hi,

Could anybody let me know how do I solve such problems quickly..

Gloria leaves home for school, riding her bicycle at the rate of 12mph. 20 min later after she leaves her mother sees Gloria's eng paper on her bed and leaves to bring it to her. If her mother drives at 36mph. how far must she drives before she reaches Gloria.

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Source: Beat The GMAT — Problem Solving | Mon Aug 17, 2009 7:50 pm

tohellandback: Legendary Member; Posts: 752; Joined: Sun May 17, 2009 11:04 pm; Location: Tokyo; Thanked: 81 times; GMAT Score:680

by tohellandback » Mon Aug 17, 2009 8:29 pm

if gloria take time t then her mother take t-1/3 to travel the same distance

12*t=36(t- 1/3)
t=3t-1
t=1/2
so distance= 12*1/2=6 miles

The powers of two are bloody impolite!!

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