Question

In a race over 4 km Ryan ran at a constant speed. Sophie, however, ran the first 2 km at a speed 1 km/h more than Ryan and ran the second 2 km at a speed 1 km/h less than Ryan. Who won the race?

Answer 1

Answer:

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Answer 2

Answer:

Ryan win race

Explanation:

Distance is 4 km

so time is distance/speed

let the speed of Ryan is x km/h

so time = 4km/x km/h

and the speed of sophie in first 2 km is 1km/h more than Ryan

so speed is (x+1 )km/h

in second 2 km is 1km/h less than Ryan speed

so speed is (x-1) km/h

so total time of sophie is (4/x+1 ) + (4/x-1)