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  1. If a train runs at 40 km/hour, it reaches its destination late by 11 minutes. But if it runs at 50 km/hour, it is late by 5 minutes only. The correct time (in minutes) for the train to complete the journey is
    1. 13
    2. 15
    3. 19
    4. 21
Correct Option: C

If the distance be x km, then

x
x
=
6
405060

⇒ 
x
x
= 1
45

⇒  x = 20 km.
∴   Required time =
20
hour – 11 minutes
40

=
1
× 60 − 11 minutes
2

= 19 minutes



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