For a particular 5 hours journey, Alex travelled at an average speed of (2x + 5) km/h for the first 2 hours. He then travelled at an average speed of (3x - 5) km/h for the last 3
hours to complete his journey.

(a)
Write down an expression, in terms of x, to represent the distance travelled by
Alex in the first 2 hours of his journey

(b)
Write down another expression, in terms of x, to represent the distance
travelled by Alex in the last 3 hours of his journey.

(c) Given that Alex travelled at an average speed of 90 km/h over the entire 5
hours journey, form an equation in terms of x and hence, solve for x.
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