The independent travel agent group nearly doubled its target of £2,500, with a group of 10 staff members travelling to West Sussex on September 23 to conquer the 12-mile obstacle course which is designed to test "strength, stamina and determination".
The funds raised will support an all-girls secondary school in Kenya, which currently has no access to clean water, sanitation or hygiene facilities.
The money will enable Just a Drop to construct a clean water tank and handwashing stations for the Kiteta School’s 592 students.
Julia Lo Bue-Said, managing director of Advantage, said: “Tough Mudder was definitely the toughest physical challenge I have ever taken part in and when we crossed the finish line we all felt euphoric.
"I am so proud of our team who just kept going on the day. As well as pushing ourselves to the limit physically, we also excelled with our fundraising efforts."