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ginger1234
10.07.2019 •
Mathematics
Atrain travels from city a to city b and then to city c. the distance from a to b is 120 miles and the distance from b to c is 187.5 miles. the average speed from a to b was 40 miles per hour, and the average speed from b to c was 75 mph. what was the average speed from a to c (that is for the entire trip) in miles per hour?
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Ответ:
The distance from a to b is d1=120 miles, distance from b to c d2=187.5 miles
average speed (velocity) from a to b is v1=40 miles/hour
average speed from b to c is v2=75 miles/hour
The formula for average speed from a to c is v= (d1+d2)/(t1+t2)
We have not time and we will calculate it
t1=d1/v1= 120/40=3 hour and t2=d2/v2=187.5/75=2.5hour
Average speed for a to c is
v=(120+187.5)/(3+2.5)= 307.5/5.5= 55.9 ≈ 60miles/hour
Good luck!!!
Ответ:
The formula for the volume of a cylinder is pi*r^2*h
r=radius= 1/2 diameter
h= the height
pi=3.14...
just get the height and plug it in
Step-by-step explanation: