Question

At 9:00 on Saturday morning, two bicyclists heading in opposite directions pass each other on a bicycle path. The bicyclist heading North is riding 4km/hour faster than the bicyclist heading South. At 10:15, they are 40 km apart. Find the two bicyclists' rates.

Answer 1

so it took an hour an 15 minutes which means the distance traveled is their speed+1/4 of their speed, also any answers that have northbound going faster than 6km/h above south is not right so B and D seems to be out of the picture.