Question 894513: mark cycle from home to school at the speed of 16km per hour.he cycles back on the same route at the speed of 15kilometers per hour.the total time taken for the journey is 7*3/4 hours.given that the distance from home to school is d kilometers,and the distane=speed*time,write and solve an equation to find the total distance traveled?
Found 2 solutions by ankor@dixie-net.com, Alan3354:
Answer by ankor@dixie-net.com(22740)   (Show Source):
You can put this solution on YOUR website! mark cycle from home to school at the speed of 16km per hour.
he cycles back on the same route at the speed of 15kilometers per hour.
the total time taken for the journey is 7*3/4 hours.
given that the distance from home to school is d kilometers,and the distance=speed*time, write and solve an equation to find the total distance traveled?
:
Write a time equation, time = dist/speed
:
go time + return time = total time
 +  = 7.75 hrs
multiply equation by the least common multiple 240, cncel the denominators:
15d + 16d = 240(7.75)
31d = 1860
d = 1860/31
d = 60 km one way
total dist = 120 km
:
Check this, find the actual time each way
60/16 = 3.75 hrs
60/15 = 4 hrs
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total time 7.75 hrs
Answer by Alan3354(69443)  (Show Source):
You can put this solution on YOUR website! mark cycle from home to school at the speed of 16km per hour.he cycles back on the same route at the speed of 15kilometers per hour.the total time taken for the journey is 7*3/4 hours.given that the distance from home to school is d kilometers,and the distane=speed*time,write and solve an equation to find the total distance traveled?
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Avg speed of the round trip = 2*16*15/(16+15) = 480/31 km/hr
RT distance = (480/31)*(31/4) = 120 km
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Notice that the distance doesn't matter for round trip, or for 2 legs of equal distance.
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google the Michelson-Morley experiment from the 1840's. You might find it interesting.
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