Question

at 9:00 o saturday morning two bicycylist heading in oppisite directions pass eachother on a bicycle path. the bicyclist heading north is riding 4km/hr faster that the bicyclist heading south. at 10:30, they are 39 km apart. find the two bicyclists rates.

Answer 1

39/1.5=26 for the 1.5 hours difference.

divide 26/2=13 for each person.

divide 4/2 for the speed increase of person north. The speeds much average to 13.

subtract 13-2=11 and add 13+2=15 for south and north.

north speed is 15 km per hour and south is 11 km per hour.