35 . Fig . 15 shows the number of telephone calls per minute at a 50 large company . ( a ) Estimate the average number of calls per minute* from 8 am to 5 pm . ( b ) From 9 am to 1 pm . velocity ( miles / hour ) 20 - - 36 . Fig . 16 shows the velocity of a car during a 5 hour trip . ( a) Estimate how far the car traveled during the 5 hours . ( b ) At what constant velocity should you drive in order to travel the 3 4 5 time ( hours ) Sammie distance in 5 hours?" Fig . 16