If a train crosses a km stone in 12 seconds how long will it take to cross 91 km stones completely i...........

Quantitative Aptitude (CDS) Problems on trains

If a train crosses a km-stone in 12 seconds, how long will it take to cross 91 km-stones completely if its speed is 60 km/hr?

1 hr 30 min

1 hr 30 min 12 sec

1 hr 51 min

1 hr 1 min 3 sec

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Explanation:

Here, we need to find the time that will take to cross 91 km stones completely.
Given that, in 1 hr. train travels 60 km i.e. 60 km is travelled in 60 min.
This means in 1 minute 1 km is travelled.
Therefore, 90 km is travelled in 90 minutes i.e. 1 hour 30 minutes
And the remaining 1 km in 12 seconds.
Thus, the total time taken is 1 hr. 30 min. 12 sec.