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## 500 ds test5# 20

This topic has 1 member reply
dunkin77 Master | Next Rank: 500 Posts
Joined
01 Apr 2007
Posted:
269 messages

#### 500 ds test5# 20

Fri Apr 06, 2007 5:00 pm
Hi,

I thought the answer was A) but actually correct answer is D)

For 2), why it is okay although we dont know the average rate for the last half??

. How many miles long is the route from Houghton to Callahan?
(1) It will take 1 hour less time to travel the entire route at an average rate of 55 miles per hour than at an average rate of 50 miles per hour.
(2) It will take 11 hours to travel the first half of the route at an average rate of 25 miles per hour.

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gabriel Legendary Member
Joined
20 Dec 2006
Posted:
986 messages
Followed by:
1 members
51
Sat Apr 07, 2007 9:56 am
dunkin77 wrote:
Hi,

I thought the answer was A) but actually correct answer is D)

For 2), why it is okay although we dont know the average rate for the last half??

. How many miles long is the route from Houghton to Callahan?
(1) It will take 1 hour less time to travel the entire route at an average rate of 55 miles per hour than at an average rate of 50 miles per hour.
(2) It will take 11 hours to travel the first half of the route at an average rate of 25 miles per hour.
shuldnt the first half be equal to the second half .. first half = 11*25= 275 so the second half is also equal to 275 .. so total distance 275*2= 550...

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