The distance of the college and home of Rajeev is 80km. One day he was late by 1 hour than the normal time to leave for the college, so he increased his speed by 4km/h and thus he reached to college at the normal time. What is the changed (or increased) speed of Rajeev?	Choices
A) 60 km/h B) 10 km/h C) 60 km/h D) 20 km/h E) 90 km/h
Explanation:   Let the normal speed be x km/h, then   x = 16 km/h   (x + 4) = 20 km/h   Therefore increased speed = 20 km/h   Answer: 20 km/h
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The distance of the college and home of Rajeev is 80km. One day he was late by 1 hour than the normal time to leave for the college, so he increased his speed by 4km/h and thus he reached to college at the normal time. What is the changed (or increased) speed of Rajeev?