A train moves with a speed of 30 kmph for 12 minutes and

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A train moves with a speed of 30 kmph for 12 minutes and for next 8 minutes at a speed of 45 kmph. Find the average speed of the train:

1. 37.5 kmph
2. 36 kmph
3. 48 kmph
4. 30 kmph

Correct Option: B

Average speed =	Total distance
	time taken

=	30 ×	12	+ 45 ×	8
		60		60

	12	+	8
	60		60

= 12 × 3 = 36 kmph