marla starts running around a circular track at the same time nick starts walking around the same circular track . marla completes 20 laps around the track per hour and nick completes 10 laps around the track per hour . how many minutes after marla and nick begin moving will marla have completed 4 more laps around the track than nick ?
"maria ' s rate - 20 laps per hour - - > 20 / 60 laps / min nick ' s rate - 10 laps per hour - - > 10 / 60 laps / min lets set equations : 20 / 60 * t = 4 ( since maria had to run 4 laps before nick would start ) 10 / 60 * t = 0 ( hick has just started and has n ' t run any lap yet ) ( 20 / 60 - 10 / 60 ) * t = 4 - 0 ( since nick was chasing maria ) t = 24 min needed maria to run 4 laps answer : c"
divide(4, subtract(divide(20, multiply(add(10, const_1), 20)), divide(10, multiply(add(10, const_1), 20))))