A train runs for 4 hours at a speed of 75 km per hour and the next 3 hours at a speed of 55 per hour. Find the average speed of the train for the 7 hours journey. - Clay6.com, a Free resource for your JEE, AIPMT and Board Exam preparation

A train runs for 4 hours at a speed of 75 km per hour and the next 3 hours at a speed of 55 per hour. Find the average speed of the train for the 7 hours journey.