8:26:12 hrs
8:27:12 hrs
7:12:34 hrs
9:12:30 hrs
B. 8:27:12 hrs
Interval of change = (L.C.M of 48,72,108)sec.=432sec.
So, the lights will again change simultaneously after every 432 seconds =7 min.12sec
Hence , next simultaneous change will take place at 8:27:12 hrs.
R/P=1216/64
R*P=1216/64
R/P=64/1216
P/R=1216/64
8:26:12 hrs
8:27:12 hrs
7:12:34 hrs
9:12:30 hrs
48 cm
55 cm
45 cm
50 cm
10368
10876
10345
10234
99
95
96
98
36
38
45
35
9999
9988
9872
9720
1394
1390
1400
1380
30
36
40
46
1683
1892
1762
1823
39800
38700
36700
37800
504
505
506
508
Find the greatest number which on dividing 1657 and 2037 leaves remainders 6 and 5 respectively.
129
136
127
199
185,153
195,153
153,195
195,143