Problems on trains

Mental Ability (N tehsildar)

Title

45:30

Video Progress

8 of 24 completed

Notes Progress

5 of 15 completed

MCQs Progress

38 of 100 completed

Subjective Progress

8 of 20 completed

Continue to Next Topic

Indian Economy - Understanding the basics of Indian economic system

Next Topic

Download Solution PDF

The distance between Howrah and Delhi is 1,450 km. A train travels from Howrah at Delhi at the speed of 60 km/hr and returns at 80 km/hr to Howrah. What is the average speed of the train for the entire journey?

70 km/hr

72.5 km/hr

64 km/hr

68.5 km/hr

Explanation:

When the 2 distances of equal length are covered with the different speeds,

then the Average speed is given as 2xy/(x+y) [Where 'x' is ongoing journey's speed and 'y' is return journey speed]

2*60*80/(60 + 80) = 2*60*80/140 = 68.57 km/hr

By: Deepak Dawra

Profile ResourcesReport error

Trial Period Ended