Answer:
Step-by-step explanation:
The key for this assignment is look at the units and values given. What is the desired units/value? You could also use d = r*t assuming a constant rate.
1.) If you look at the units for distance and time, and you know you want m/s for speed, then you can see division would be solution.
d = rt
40 = r(10)
r = 40/10
2.) d = rt
425 = (50)t
t = 8.5s
3.) d = rt
d = (35.25)(4)
d = 141km
4.) Add the distances together by using the equation twice for the way there and back.
216 = (48)t
t = 4.5
216 = (54)t
t = 4
4.5 + 4 = 8.5 hours
5.) Do the same thing from problem number four
210 = r(3.5)
r = 60m/h
130 = r(2.5)
r = 52mi/h
Average means the sum of the values divided by 2
0.5(60+52) = 56mi/h
