Question
If a train runs at 40 kmph, it reaches its destination late by 11 minutes but if it runs at 50 kmph , it is late by 5 minutes only . The correct time for the rain to complete its journey is :
Answer: Option C
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Let the correct time to complete the journey be `x` min.
Distance covered in `(x + 11)` min. at 40 kmph = Distance covered in `(x + 5)` min. at 50 kmph.
`:.` ` ((x + 11))/(60) xx 40 = ((x + 5))/(60) xx 50 hArr x` = 19 min.
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