book Maths Puzzle Numerical Ability

(I am trying to understand my sons home work )
how do we solve systems by subtitution?

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book Other Question

In a survey conducted on 3400 officers of an establishment, 48% prefer whiskey (W), 54% like beer (B) while 64% juice (J). Moreover, 28% drink W and B, 32% drink B and J, and 30% d Leon drove 270 miles to the lodge in the same time as Pat drove 330 miles to the lodge. If Pat drove 10 miles per hour faster than Leon, then how fast did each of them drive?

So