Question

The speed of the train in going from raipur to varanasi is 100 km/hr while when coming back from varanasi to raipur its speed is 150 km/hr find the average speed of whole journey

Answer 1

Answer:

120

Step-by-step explanation:

avg. speed = total distance /total time

= d+d

------------------------

(d/100)+(d/150)

= 2

------------------------

(2+3)/300

= 2*300/5

= 120 kmph