The speed of a train going from Nagpur to Allahabad is 100

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The speed of a train going from Nagpur to Allahabad is 100 kmph while its speed is 150 kmph when coming back from Allahabad to Nagpur. Then the average speed during the whole journey is :

1. 120 kmph
2. 125 kmph
3. 140 kmph
4. 135 kmph

Correct Option: A

∴ Average speed =		2 × 100 × 150		kmph
		100 + 150

=	2 × 100 × 150	= 120 kmph
	250