Question

A light was seen at intervals of 13 second. It was seen for the first time at 1 hr. 54 min 50 secs, a.m. and the
last time at 3 hrs. 17 min. 49 secs, a.m. How many times was the light seen
(1) 360
(3) 378 (4) 384
(5) None of these​

Answer 1

Answer:

First Time = 1 hour 54 mins 50 seconds

Last Time = 3 hours 17 mins 49 seconds

Duration = (3h 17min 49s) - (1h 54 min 50 s)

                = 1 h 22 mins 59 s

                = 4979 seconds    

Number of 13 seconds interval = 4979 ÷ 13

                                                   = 383     

Total number of times the light is seen = 383 + 1

                                                                 = 384    

Answer: The light was seen 384 times

Step-by-step explanation: