A man cycles for x hours at 12km/h...

Problema Solution

A man cycles for x hours at 12km/h and y hours at 18km/h. Altogether he cycles 78km in 5hours. Find x and y

12x+18y = 78

and, x = 5-y

so 60-12y+18y = 78

or, 6y = 18

so, y = 3 hours

x = 2 hours

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