Answer:
175/3 or 58.333...
Step-by-step explanation:
This is fairly complicated but I will try to make it as simple as possible. I also apologize in advance for how impossible it is to make fractions look like fractions. I also had to insert a bunch of unnecessary parentheses just because the fractions that I can make are relatively inaccurate.
The distance between 2 cities can be represented as d.
Time is d/r if r is rate, so B->NY=d/50
Similarly,NY->B is d/70
Obviously the average speed is 2d/(d/50+d/70), this is just an average time
Now just remove the d and get (d/d)*2/(1/50+1/70)
You can now multiply by the LCM/LCM, which is 350/350.
After calculating you will get 700/12 which is 58.333...(This is how to enter into your RSM browser) Hope this helps. Sorry it is so late.
The average speed of the truck for the whole trip is 58mph.
rate = 50 mph
distance = x miles
time = d/r = x/50 hrs
rate = 70 mph
distance = x miles
time = d/r = x/70 hrs
Average speed = (total distance)/(total time) = 2x/(x/50 + x/70)
Average speed= (2x)/(70x + 50x)/(50×70)
Average speed= (2x)/[120x/3500]
Average speed= 2/(0.034)
Average speed= 58 mph
Inconclusion the average speed of the truck for the whole trip is 58mph.
Learn more about average speed here:https://brainly.com/question/4931057
