Verified Answer :

ratio=number of Km / number of hours

Data:
Number of Km=5 Km
Number of hours=1  1/2 hour=1.5 hour.

Ratio=5 km/1.5 hour=3.333... km/h≈3.33 km/h.

Answer; their ratio was 3.33 Km/h.

haruhi

If they went five km in 1&1/2 hours then their rate would be:
\(\frac{5}{1&1/2}\)= 5÷\(\frac{3}{2}\)= 5×\(\frac{2}{3}\)= \(\frac{10}{3}\)=3\(\frac{1}{3}\)

so 3\(\frac{1}{3}\) km per hour

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