Two children injured when inflatable biscuit crashes into fishing boat near Yarrawonga at the NSW/Victoria border

Two children have been injured, including one seriously, while riding an inflatable biscuit on a lake at the NSW-Victoria border at the weekend.

The inflatable was being towed by a jet ski when it was coming round a bend and smashed into a stationary fishing boat on Lake Mulwala, near Yarrawonga about 11.30am on Sunday, police said.

WATCH THE VIDEO ABOVE: Lifesavers respond to a record number of callouts

A 10-year-old girl suffered upper and lower body injuries and was airlifted in a serious but stable condition to the Royal Children’s Hospital.

A 34-year-old sustained lower body injuries and was airlifted to The Alfred hospital in a serious but stable condition.

Another child, an eight-year-old boy, suffered upper body injuries and was hospitalised in a stable condition.

Victoria Police are investigating the incident and will speak with the driver of the jet ski towing the biscuit as well as the skipper of the stationary boat.

The incident came as temperatures soared into the 40s over the weekend, with Victorian Surf Life Savers performing a slew of rescues across the state.

Saturday was their busiest day in two decades, with 145 rescues performed.

“In my 20 years plus with this organisation, I don’t remember a day in Victoria we performed that many rescues in a single day,” Kane Treloar, director of lifesaving services at Life Saving Victoria, said.

“We don’t remember a day where we’ve been that busy.”

Temperatures in Victoria are set to ease on Monday, with the state expecting patchy rain and showers.