Answer:
53.2 mph
Step-by-step explanation:
A truck driver travels at an average speed of 65 miles per hour on a 200 miles trip to collect a load of freight
On the return trip the average speed is 45 miles per hour
Average speed= total distance/total time
The first step is to calculate the total time
Time spent when going on the trip(t1) can be calculated as follows
200 = 65 × t1
t1= 200/65
t1= 3.0769 hrs
The time spent when returning from the trip can be calculated as follows
200 = 45 × t2
t2= 200/45
t2= 4.44 hrs
Total time = 3.0769 hrs + 4.44hrs
= 7.521 hrs
The total distance can be calculated as follows
= 2×200
= 400
Therefore the average speed for the round trip can be calculated as follows
= 400/7.521
= 53.2 mph
Hence the average speed for the round trip is 53.2 mph
