Physics
posted by Jade on .
1. A person runs 800. m at an average speed of 6.00 m/s and then the next 800. m at an average speed of 8.00 m/s. Calculate (a) the total time of travel and (b) the average speed.
2. Sam travels by car from one city to another. He drives for 45.0 min at 95.0 km/h, 30.0 min at 100.0 km/h, and he spends 25.0 min eating lunch and buying gas. Determine (a) the total distance traveled and (b) the average speed for the entire trip.

Using
Distance = speed * time
(a)
Total time of travel
=800m/6s + 800m/8s
= 233.3s
(b)
Total distance = 800+800=1600m
Average speed = total distance/total time
=1600m/233.3s
= 6.86 m/s
Try #2 which is similar to #1.