On a particular day, the wind added 3 km per hour to Alfonso’s rate when he was cycling with the wind and subtracted 3 km per hour from his rate on his return trip. Alfonso found that in the same amount of time he could cycle 36.5 km with the wind, he could go only 24 km against the wind. What is his normal bicycling speed with no wind?
a. 15 km/h c. 35 km/h
b. 40 km/h d. 45 km/h

Question

On a particular day, the wind added 3 km per hour to Alfonso’s rate when he was cycling with the wind and subtracted 3 km per hour from his rate on his return trip.  Alfonso found that in the same amount of time he could cycle 36.5 km with the wind, he could go only 24 km against the wind.  What is his normal bicycling speed with no wind?
a. 15 km/h c. 35 km/h 
b. 40 km/h d. 45 km/h