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Discussion

Quantitative Ability Preparation for CDS
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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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Ajay Kumar

Isn't it should be this way? speed of train = 50/3 m/s time = 12 sec distance = speed * time but the distance = length of train 1km stone i.e. l 1000 = 50/3 *12 which is not possible.. where am i wrong here? thanks in advance.