Question

please help me to do this question​

Answer 1

Answer:

FOR EASY OF CALCULATION WE CAN CONVERT BOTH INTO IMPROPER FRACTION

DAVID TAKES 39/4MINUTES

IF WE FIND THE NUMERICAL VALUE DAVID TAKES ABOUT 9.75MINUTES AND 7 .33 MINUTES SO

DAVID TAKES MORE TIME

$39 \div 4 - 22 \div 3 \\ = (117 - 88) \div 12 \\ = 29 \div 12 \\ = 2 \: + \: \: \: \: 5 \div 12$

2 5/12