Question 251299: A man travels from A to B at average speed of 30 miles per hour and returns from B to A along the same route at an average speed of 60 miles per hour. Find the average speed of the entire journey.
Find out the average speed of person who rides the first mile at the rate of 8 miles an hour, the next mile at the rate of 7.5 miles an hour and the third mile at the rate of 5.5 miles an hour.
A bus traveling200 kilometer has 10 stages at equal intervals. The speed of the bus in the various stages was observed to be 10,15,20,25,20,30,40,50,30,40 kilometers per hour. Find the average speed at which the bus travels.
Find out the average rate of (i) motion in the case of a person who rides the first mile at the rate of 10 miles an hour, the next mile at the rate of 8 miles per hour and the third mile at the rate of 6 miles per hour;(ii) increase in population which in the first decade has increased 20% in the next 25% and in the third 44%
Answer by richwmiller(17219)   (Show Source):
You can put this solution on YOUR website! You have too many questions lumped together.
Re-post unanswered questions separately if you want answers.
A man travels from A to B at average speed of 30 miles per hour and returns from B to A along the same route at an average speed of 60 miles per hour. Find the average speed of the entire journey.
rate*time=distance
The distance AB=BA
In one direction he goes 30 miles and on the return in one hour he goes 90.
In 2 hours he goes 90 miles.
rate *time=distance
r*2=90
r=90/2
r=45 mph
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