A light was seen regularly at an interval of 13 seconds It was seen for the first time at 1 hour 54 ...........

Quantitative Aptitude (CDS) Time & distance

A light was seen regularly at an interval of 13 seconds. It was seen for the first time at 1 hour 54 minutes 50 seconds (a.m.) and the last time at 3 hours 17 minutes 49 seconds (a.m.). How many times was the light seen?

375

378

383

384

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Explanation:

1st time seen=1 hour 54 min 50 sec=3600+54*60+50= 6890 sec
2nd time seen= 3 hors 17min 49 sec=3600+17*60+49=11869
interval between seen=11869-6890
No. of times=4979/13+1=384