Syntel Company Numerical Ability Time Distance and Speed

Brindavan Express started from Chennai Central Station at 7.10 am. Karnatak express train for the same destination started from the same station on the same day at 8.40 am and ran with an average speed of 60 km/hour. Karnatak express crossed the Brindavan Express at 11.40 am. Find the average speed of Brindavan Express.

a)75 km/hr b) 40 km/hr c)30 km/hr d) 45 km/hr

Read Solution (Total 1)

b) 40 km/hr

Karnatak Express train crosses the Brindavan Express in three hours
Distance covered by Karnatak express when it crosses Brindavan Express = Speed of Karnatak Express x Time Until It Crosses Brindavan = 60 x 3 = 180 km
This means that, Brindavan express would had covered the same distance 180 Km from Chennai when it is crossed (Overtook) by Karnatak.

The distance covered by Brindavan Express from 7.10 am till 11.40 am = 180 km (in 4 1/2 hours)
So the average speed of Brindavan Express is = Distance covered by Brindavan till crossing / Time taken till crossing = 180 / 4 1/2
180 / 9 x 2 = 40 km/hour
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