The speed of the train going from Nagpur to Allahabad is 100 km/h while when coming back from Allahabad to Nagpur, its speed is 150 km/h. Find the average speed during whole journey?

A) 125 km/hr

B) 75 km/hr

C) 135 km/hr

D) 120 km/hr

We know that:

Average Speed = (a + b)/2

                             = (100 +150)/2

                              = 125 km/hr

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