NCHMCT JEE 2013 Question Paper with solutions for online practice

Question : 93 of 200

Marks: +1, -0

In a journey of 160 km, a train covers the distance 120 km at a speed of 80 km/hr and the remaining distance at 40 km/hr. The average speed of the train for the whole journey is:

60 km/hr
64 km/hr
68 km/hr
72 km/hr

Validate

Solution:

Time taken by train to cover a distance of 120 km =

{120}/{80}

hr =

3/2

hrs
Time taken by train to cover a distance of 40 km remaining distance is

{40}/{40}

hr = 1 hr
Total time taken =

3/2

+ 1 =

5/2

hrs
Average speed =

{\Total \distance}/{\Total \time}

{160×2}/5

= 64 km/hr

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