Error in book? Please confirm.

  • Thread starter Holocene
  • Start date
  • #1
231
0
A highway and a train track run parallel to each other. At 5:00 a train crosses a river. Fifteen minutes later, a car, traveling in the same dirrection, crosses the river. The train's average speed is 52mph, the car's is 64mph. When will the car pass the train?

15 minutes = 1/4hour, so train traveling 52mph is 13 miles away from the car over the river.

64 - 52 = The vehicles are converging at a rate of 12mph.

From D = RT, T = D/R. So,

T = 13/12

13/12 = 1 and 1/12th of an hour, or 65 minutes.

The car should pass the train in 01:05, or at 6:05.

This answer is not listed among the choices.

WTF???
 

Answers and Replies

  • #2
107
1
5:15 + 65 mins. = 6:20...
 
  • #3
107
1
and also, i can't help myself, maybe you would've gotten 6:20 with a graphing calculator :)

jk. although i do love my ti83
 
  • #4
231
0
5:15 + 65 mins. = 6:20...
wow, what a dumb error on my part.

Thanks.
 
  • #5
231
0
and also, i can't help myself, maybe you would've gotten 6:20 with a graphing calculator :)

jk. although i do love my ti83

haha, thanks.
 

Related Threads on Error in book? Please confirm.

  • Last Post
Replies
12
Views
3K
Replies
6
Views
2K
  • Last Post
Replies
3
Views
2K
  • Last Post
Replies
4
Views
3K
Replies
6
Views
2K
  • Last Post
Replies
1
Views
2K
  • Last Post
Replies
2
Views
2K
  • Last Post
Replies
2
Views
1K
  • Last Post
Replies
5
Views
2K
  • Last Post
Replies
2
Views
922
Top