taxi ride

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joanjgonzalez: Junior | Next Rank: 30 Posts; Posts: 11; Joined: Fri Nov 21, 2008 7:02 am

by joanjgonzalez » Wed Dec 17, 2008 8:41 am

Hey guys, can anybody help me with this one?

The cost of a taxi ride is $1.20 for the first quarter mile and $0.40 for each succeding quarter mile. What is the cost in dollars for a taxi ride of m miles?

a. 1.20+1.60m
b. 0.80+1.60m
c. 0.80+0.40m
d. 1.60m-0.40
e. 1.60m-1.20

IMO is
[spoiler]b

Thanks![/spoiler]

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Source: Beat The GMAT — Problem Solving | Wed Dec 17, 2008 8:41 am

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Brent@GMATPrepNow: GMAT Instructor; Posts: 16207; Joined: Mon Dec 08, 2008 6:26 pmFollowed by: 1268 members; Location: Vancouver, BC; Thanked: 5254 times; GMAT Score:770

by Brent@GMATPrepNow » Wed Dec 17, 2008 8:53 am

For me, the easiest way is to simply ignore the part about "$1.20 for the first quarter mile."

If we ignore this, we can see that it costs $1.60 for every mile (or 1.60m)
But of course, we can't just leave out that part.

Our answer so far of 1.60m doesn't take into account the fact that the first 1/4 mile costs more than the subsequent 1/4 miles.
How much more? $0.80 more.
So, we need to add that to our current total
We get 1.6m + 0.8 (B)

Brent Hanneson - Creator of GMATPrepNow.com

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mrsmarthi: Senior | Next Rank: 100 Posts; Posts: 45; Joined: Sun Nov 30, 2008 8:41 pm; Thanked: 4 times

by mrsmarthi » Wed Dec 17, 2008 8:23 pm

Brent Hanneson wrote:For me, the easiest way is to simply ignore the part about "$1.20 for the first quarter mile."

If we ignore this, we can see that it costs $1.60 for every mile (or 1.60m)
But of course, we can't just leave out that part.

Our answer so far of 1.60m doesn't take into account the fact that the first 1/4 mile costs more than the subsequent 1/4 miles.
How much more? $0.80 more.
So, we need to add that to our current total
We get 1.6m + 0.8 (B)

Tha't a cool way of solving the problem in shorter time. These are type of tricks we learn from Beat The GMAT. Thanks

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msd_2008: Senior | Next Rank: 100 Posts; Posts: 66; Joined: Sun Jun 29, 2008 8:37 pm; Location: India; Thanked: 1 times

by msd_2008 » Thu Dec 18, 2008 3:50 am

I didn't understand how did you arrive at the $1.60 per mile figure. The question says that $1.20 for first quarter mile and $0.40 for each succeeding quarter mile......i think this means that 1.20x1 + 3x0.40 (because there are 3 more quarters in the one mile) = 1.20 + 1.20 = $2.40 per mile and hence for m miles it will be $2.40 m

Can you please correct my understanding?

Regards
MSD

When the going gets tough, the tough gets going.

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dmateer25: Community Manager; Posts: 1049; Joined: Sun Apr 06, 2008 5:15 pmFollowed by: 27 members; Location: Pittsburgh, PA; Thanked: 113 times; GMAT Score:710

by dmateer25 » Thu Dec 18, 2008 6:46 am

It only costs 1.20 for the FIRST quarter mile.

Not for each first quarter mile of every succeeding mile.

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msd_2008: Senior | Next Rank: 100 Posts; Posts: 66; Joined: Sun Jun 29, 2008 8:37 pm; Location: India; Thanked: 1 times

by msd_2008 » Thu Dec 18, 2008 10:43 pm

Thanks Dmateer.....got it.

When the going gets tough, the tough gets going.

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msd_2008: Senior | Next Rank: 100 Posts; Posts: 66; Joined: Sun Jun 29, 2008 8:37 pm; Location: India; Thanked: 1 times

by msd_2008 » Thu Dec 18, 2008 11:30 pm

Thanks Dmateer.....got it.

When the going gets tough, the tough gets going.

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