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By Andrew1218 (Andrew1218) on Friday, July 09, 2004 - 08:35 pm: Edit |

ok, I just did a test out of 10 reals i missed 2 questions, 1 was a dumb mistake and 1 i have no clue..this is the first SAT I problem i havent been able to atleast figure out after I spend a while on it and think about it. so here it is...

Ms. Clark drove from her home to the museum at an average speed of 40 mph and returned home along the same route at an average speed of 35 mph. If her total driving time for the trip was 2 hours, how many MINUTES did it take Ms. Clark to drive from her home to the museum?

this is really really annoying me that i cant do this problem, so i would really appreciate it if someone showed me how to do this.. muchas gracias

By Joshjmgs (Joshjmgs) on Friday, July 09, 2004 - 10:31 pm: Edit |

t1 = time there

t2 = time back

t1 + t2 = 120

t1 = 120 - t2

40 miles/hour * 60 minutes/1 hour =miles/minute

35 miles/hour * 60 minutes/1 hour =miles/minute

velocity*time = distance

Since she travels the same distance

(40*60)*(t1) = (35*60)*(t2)

Plug in for t1

(40)*(120 - t2) = 35*t2

4800 - 40t2 = 35t2

4800 = 75t2

t2 = 64 minutes

The t1, the time in which it took Ms. Clark to drive from her home to the museum is 120-64 = t1 = 56 minutes

By Andrew1218 (Andrew1218) on Saturday, July 10, 2004 - 03:03 am: Edit |

thanks a lot..that is actually a pretty hard problem for SAT I math

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