SOLUTION: a man cover 15 km in 3 hours, partly by walking and partly by cycling. If he walks 3km/h and cycle at 9km/h then what distance did he cycle?

Question 697082: a man cover 15 km in 3 hours, partly by walking and partly by cycling. If he walks 3km/h and cycle at 9km/h then what distance did he cycle?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = distance he walked in km
= distance he cycled in km
Let = the time spent walking in hrs
= time spent cycling in hrs
--------------------------
(1)
(2)
----------------------
(2)
Substitute (1) into (2)
(2)
(2)
(2)
(2)
and, since
(1)
(1)
(1)

He cycled 9 km
check answer:
(2)
(2)
(2)
and
(1)
(1)
(1)
OK
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