Question 987193
.
Express bus trip=(10 mi/40mph)(60min/1hr)=15 minutes
Local bus trip=(10mi/30mph)(60min/1hr)+(5stops)(2min/stop)
Local bus trip=20 minutes+10 minutes=30 minutes
.
express-local=30min-15min=15 minutes
.
ANSWER: You save 15 minutes by taking the express bus.