SOLUTION: a car travel first 30 km with a unifom speed of 60 km/h and the next 30 km with uniform speed of 40 km/h calculate first the total time of journey and average speed of the car?

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Question 343938: a car travel first 30 km with a unifom speed of 60 km/h and the next 30 km with uniform speed of 40 km/h calculate first the total time of journey and average speed of the car?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Rate*Time=Distance
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R%2At=D
t=D%2FR
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t%5B1%5D=30%2F60=1%2F2hr
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t%5B2%5D=30%2F40=3%2F4hr
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Total Time:T=t%5B1%5D%2Bt%5B2%5D=1%2F2%2B3%2F4=2%2F4%2B3%2F4=5%2F4hrs=75minutes
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Average Speed=Total Distance/Total Time
Vave=60%2F%285%2F4%29=48km/h