Question

linear equations two variables

Answer 1

take speeds of bird and wind as x&y
time taken=d/speed
d=45 km
times are given
45/x+y=2.5
45/x-y=4.5
take reciprocal and add
1/2.5+1/4.5=2x/45
2.5+4.5/(2.5*4.5)=2x/45
x=14
y=4(by substituting x)
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