mathematics...

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kopisake: Newbie | Next Rank: 10 Posts; Posts: 1; Joined: Wed Aug 17, 2011 12:17 am

by kopisake » Wed Aug 17, 2011 12:22 am

how i can do this?
I----------------------I-----------I
p 240km q 75km r

ali drives from p to q..the time taken for the journey from p to q is 3hours,while from q to r is
1+1/2hours..what the average speed of the whole journey????????help me with urgent situation..heheheh

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Source: Beat The GMAT — Quantitative Reasoning | Wed Aug 17, 2011 12:22 am

mukgera: Senior | Next Rank: 100 Posts; Posts: 77; Joined: Tue Aug 16, 2011 11:49 pm; Thanked: 3 times

by mukgera » Wed Aug 17, 2011 2:49 am

avg speed = total distance / total time.

total distance = 240 + 75 = 315 Km
total time = 3 + 1.5 = 4.5 hour

So Avg Speed = 315 /4.5 = 70 Km/hr

I hope this would be clear.

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