Pedestrian up-down hill

The pedestrian goes for a walk first on the plane at 4 km/h, then uphill at 3 km/h. Then it is in the middle of the route, turns back, and goes downhill at 6 km/h. The total walk was 6 hours. How many kilometers went pedestrians?

Correct answer:

s =  24 km

Step-by-step explanation:

T=6 h c=1/2=21=0.5 h  T=a+b+c+a 4a+3b=6c+4a  6=a+b+0.5+a 4a+3b=6 0.5+4a  6=a+b+0.5+a 4 a+3 b=6 0.5+4 a  2a+b=5.5 3b=3  b=33=1 a=25.5b=25.51=2.25  a=49=2.25 b=1  s=4 a+3 b+6 c+4 a=4 2.25+3 1+6 0.5+4 2.25=24 km



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