126 km in 2 1/4 h

I assume you wish to know the rate....this  equals distance / time...so we have

126 km / 2.25 hr = 56km/hr

Traveling at a speed of 56 kmh whould be the answer 56 + 56 = 112. 56 divided by 4 or 1 quarter is 14. 112 + 14 = 126