Question

i want equations for this problem.
3rd question.and 6th question

Answer 1

6. let the usual time be x
usual speed= 360/x
a/c
360/x-3=(360/x) +10
360/x-3=360+10x/x
360x=x-3(360+10x)
360x=360x+10x^2+-1080-30x
360x -360x -10x^2-1080-30x
10x^2 -1080-30x=0
10x^2-30x -1080=0
x^2 -3x-108=0
x^2-12x+9x-108=0
x(x -12)+9(x -12)=0
(x-12)(x+9)
x=12
usual speed = 360/12=30km/hour.
I hope these two solution would help you

Answer 2

Answer:

refer to attached..

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