Mark M. answered • 12/22/17

Mathematics Teacher - NCLB Highly Qualified

tu = AB

The return trip took 0.9t (2t - t - 0.9t)

AB = 0.9tr

tu = 0.9tr

u = 0.9r

1.11...u ≈ r

Dalila K.

asked • 12/22/17'A cyclist travelling at an average speed of *u* km/h takes t hours to travel from A to B. On reaching B, the cyclist rests for 0.1*t* hours before returning from B to A along the same route. If the cyclist reaches A 2*t *hours after first setting out, find an expression for the average speed of the cyclist on the return journey.'

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Mark M. answered • 12/22/17

Mathematics Teacher - NCLB Highly Qualified

tu = AB

The return trip took 0.9t (2t - t - 0.9t)

AB = 0.9tr

tu = 0.9tr

u = 0.9r

1.11...u ≈ r

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