0653/11 Science Combined May Jun 2019 Online Test | Cambridge IGCSE MCQ
A car driver sets out from home to travel to Cambridge. After 1 hour he is 40 km from home. He discovers that he must return home to collect his briefcase. This journey also takes him 1 hour. He sets off again immediately. He reaches Cambridge, 100 km from home, 2 hours later.
What is the average speed for the whole of his journey from leaving home the first time?