Question

A girl goes to her friend’s house, which is at a distance of 12 km. She covers half of the distance at a speed of x km/hr and the remaining distance at a speed of (x + 2) km/hr. If she takes 2 hrs 30 minutes to cover the whole distance, find ‘x

Answer 1

Answer:

The girl covers half of the distance at the speed of x km/h and the remaining at a speed of x+2 km/h.

so 6/x +6/x+6 = 2.5

12 + 12x / x(x+6) = 5/2

5x²- 14x - 24 = 0

x = 4, -6/5

negative value is neglected

so

x = 4

Step-by-step explanation:

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