PP-T1-178

[max999]

請教PP數學題，求助大牛們

178.
Adam and Beth each drove from Smallville to Crown City by different routes. Adam drove an an average speed of 40 miles per hour and completed the trip in 30 minutes. Beth's route was 5 miles longer, and it took her 20 minutes more than Adam to complete the trip. How many miles per hour was Beth's average speed on this trip?
(A) 24 (B) 30 (C) 48 (D) 54 (E) 75
Ans:B

[amyliang]

D/T=speed
first A 40miles per hour, he spent 30 min. which means that he drove 20 miles.
B is 5 miles longer, (20+5=25), and took her 20 minutes.

25/(30+20) =x/60
finding x is your answer

[max999]

Thanks amyliang