Frank can mow his own yard in 45 minutes. Joe's yard is 40% larger than Frank's, but Joe can mow his own yard in an hour. How long would it take them, working together, to mow both yards? Express your answer as mm:ss, where mm is the number of minutes and ss is the number of seconds, rounded to the nearest whole number, it would take them.
+36916 Frank Rate = 1 yd / 45 min
Joe Rate = 1.4 yd / 60 min
Total job = 1 yd + 1.4 yd = 2.4 yd
Time for both = 2.4 yd / (1/45 + 1.4 /60 ) = 52.68 min = 52 min 41 sec 52:41
+36916 Frank Rate = 1 yd / 45 min
Joe Rate = 1.4 yd / 60 min
Total job = 1 yd + 1.4 yd = 2.4 yd
Time for both = 2.4 yd / (1/45 + 1.4 /60 ) = 52.68 min = 52 min 41 sec 52:41
