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Q.

train does a journey without stoppage in 8 hours, if it had travelled 5 km/h faster, it would have done the journey in 6 hours 40 minutes. Find its original speed.

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a

25 km/h

b

45 km/h

c

36.5 km/h

d

40 km/h

answer is A.

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Detailed Solution

Let original speed= S km/h 

Here, distance to be covered is constant

S×8=(S+5)203

8S203S=1003 S=1004=25 km/h

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