Question
It took Esteban 1 minute and 20 seconds to travel one mile. If he then drives this one mile distance in 55 seconds, how much faster is he driving in miles per hour?
Answers
PsyDAG
60(4/3 min.)*1 mile = 80 mph
(55/60 min)60 * 1 mile = 55 mph
(55/60 min)60 * 1 mile = 55 mph
Steve
the times are 80 seconds and 55 seconds
1mi/80s * 3600s/hr = 45 mi/hr
1mi/55s * 3600s/hr = 65.45 mi/hr
Now just subtract
1mi/80s * 3600s/hr = 45 mi/hr
1mi/55s * 3600s/hr = 65.45 mi/hr
Now just subtract