The distance of the office and home of Mr Miglani is 80 km. One day he was late by 1 hour than the normal time to leave for the office. He increased his speed by 4 km/h and thus reached at the normal time. What is the changed (or increased) speed of Miglani?

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The distance of the office and home of Mr Miglani is 80 km. One day he was late by 1 hour than the normal time to leave for the office. He increased his speed by 4 km/h and thus reached at the normal time. What is the changed (or increased) speed of Miglani?