SOLUTION: A girl walks 24 km at the speed of x km/hr and 40 km at the speed of y km/hr on 1st day. she walks total for 9 hrs on that day. on the next day she walks 18 km at the speed of x km
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Question 732470: A girl walks 24 km at the speed of x km/hr and 40 km at the speed of y km/hr on 1st day. she walks total for 9 hrs on that day. on the next day she walks 18 km at the speed of x km/hr and 48 km at the speed of y km/hr. On that day also she walks for total 9 hrs.Find x and y?
Answer by josgarithmetic(39614) (Show Source): You can put this solution on YOUR website!
Day 1:
hours.
Multiply both sides by xy.
Day 2:
hours.
Multiply both sides by xy.
Those equations might be good to use, but maybe taking the first form of those equations, and trying substitution is better or easier. The system is not linear in x and y.
Day 1 equation, ,
Day 2 equation,
Substitute for y,...
.
...so manyy steps,...
.
.
OR
You can continue onward to solve for y.
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