SOLUTION: On Saturday, Erica and Bianca travel 324 km. They reach their destination in 4 hours. What is their average speed?

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Question 937164: On Saturday, Erica and Bianca travel 324 km. They reach their destination in 4 hours. What is their average speed?

Found 2 solutions by srinivas.g, MathLover1:
Answer by srinivas.g(540) About Me  (Show Source):
You can put this solution on YOUR website!
distance traveled = 324 km
time = 4 hrs
average speed = +distance%2Ftime
=+324%2F4
=81 km/hr
Result: Average speed =81 kmph

Answer by MathLover1(20855) About Me  (Show Source):
You can put this solution on YOUR website!
recall: d=s%2At where d=distance, s=speed, and t=time

if they travel d=324km in t=4h, then we have

324km=s%2A4h

324km%2F4h=s

cross%28324%2981km%2Fcross%284%29h=s

s=81%28km%2Fh%29