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Terry bicycles for 1/4 at an average speed of x km/hr. He then cycles for 1/3 hour at an average speed of x+10 km/hr. he cycles a total distance of 15 km. work out the value of x.

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(1/4)x + (1/3)(x+10) = 15

(7/12)x = 15 - 10/3 = 35/3

(1/12)x = 5/3

x = 60/3 = 20

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