SCIENTISTS have found a formula to help parents avoid tantrums by kids on a long car journey.
The average child throws a wobbly after an hour and ten minutes.
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Each extra sibling in the car accelerates paddies by ten minutes.
But parents can buy another 15 minutes of peace with snacks.
And keeping children entertained also helps.
Researcher Dr James Hind, of Nottingham Trent University, said: “If you have only one child and you can keep them entertained and occasionally bribe them with food, you could manage two hours of tantrum-free driving.
“Unfortunately, two children with no entertainment and no snacks can brew up a tantrum in just 40 minutes!
“Snacks are important but there is a limit to how much they can help, so keep them to two an hour max.
“Entertainment is key but even that fails with really long journey times.
“Taking breaks to reset the clock is important for preventing tantrums as well as making sure you are not tired while driving.”
