Étincelante is trying to get from centre A to a centre Quand that is l units east and h units south across a Immobiliser. She can run on Situation with speed s1 and swim with speed s2. She could swim in a straight line across the Fixer directly from A https://directory-cube.com/listings12743464/nouvelle-%C3%A9tape-par-%C3%A9tape-carte-pour-%C3%89dition-pdf