Speedometer readings for a motorcycle at 12 second intervals are given in the table

t 0 12 24 36 48 60

v 27 20 30 28 20 21

Estimate the distance in feet traveled by the motorcycle during the time interval from 0 to 60 seconds using the velocities at the beginning of the time intervals?

Givan another estimate using the velocities at the end of the time periods?