SOLUTION: after 3 hours a car has covered a distance of 90km. How fast (speed) was the car traveliing? A girl swims 50 meters in 25 seconds. what is her speed? What is the speed of a c

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Question 835538: after 3 hours a car has covered a distance of 90km. How fast (speed) was the car traveliing?
A girl swims 50 meters in 25 seconds. what is her speed?
What is the speed of a car that travels 420km in 6 hours?
How fast do you walk if you take 2.5 hours to cover 12.5km?

Thank you...need help!
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
These all use the formula
+d+=+r%2At+, or
( distance ) = ( rate )*( time )
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There are 2 other ways to express this formula:
+r+=+d%2Ft+
( rate ) = ( distance ) / ( time )
---------------------------
+t+=+d%2Fr+
( time ) = ( distance ) / ( rate )
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After 3 hours a car has covered a distance of 90km.
How fast (speed) was the car traveling?
For this, you need +r+=+d%2Ft+
+r+=+90%2F3+ km/hr
+r+=+30+ km/hr
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A girl swims 50 meters in 25 seconds. what is her speed?
Again, you need to use: +r+=+d%2Ft+
+r+=+50%2F25+ m/sec
+r+=+2+ m/sec
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What is the speed of a car that travels 420km in 6 hours?
+r+=+420%2F6+ km/hr
+r+=+70+ km/hr
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How fast do you walk if you take 2.5 hours to cover 12.5km?
+r+=+12.5%2F2.5+ km/hr
+r+=+5+ km/hr