Problema Solution
If you drive for 2 hours at 80 km/hour, how fast must you drive during the next hour in order to have an average speed of 75 km/hour?
Answer provided by our tutors
In order for average to be 75, time is 3 hours
=> (80+80+x)/3= 75
(160+x)3= 75
160+x=225
x=65