Trains Boats and Streams Practice Test 2 with solutions

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Question : 19 of 40

Marks: +1, -0

Find the average speed of a train that covers the first-half at the constant speed of 70 km/hour and other half at 100 km/hour.

80 km/hour
83.33 km/hour
82.35 km/hour
85 km/hour
None of these

Solution:

Average speed =

{2xy}/{x+y}

=

{2×70×100}/{170}

= 82.35 km/hours

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