First figure out how long it takes to help one toddler: 4 minutes + 3 minutes = <<4+3=7>>7 minutes
Then multiply the time per toddler by the number of toddlers: 7 minutes/toddler * 2 toddlers = <<7*2=14>>14 minutes
Now add the time spent helping the toddlers to the time Jack spends on his own shoes: 14 minutes + 4 minutes = <<14+4=18>>18 minutes
#### 18