How do you beat the game Bridge Crossing

Take the Boy in yellow and the wheel chair guy across.
Then the Boy in yellow back across
Get the old lady and the girl in pink and take them across
Get the wheel chair kid back across
Then the guy in the suit and the wheel chair boy across
Take the wheel chair boy back across
Then the final step is to take the guy in yellow and the wheel chair boy across
You should have 1 minute left