Max can mow the lawn in 40 minutes. If it takes him twice that long to fertilize the lawn, how long will it take him to both mow and fertilize the lawn? Think carefully first, then make a decision:
It takes Max 2 * 40 minutes = 80 minutes to fertilize the lawn. In total, Max takes 80 minutes + 40 minutes = 120 minutes to both mow and fertilize the lawn. So, the answer is 120.