CTET Class I to V 2016 Feb Paper

$672\times 36\times 25=604800$
Checking option (a) Number of seconds in 5 days $=5\times 24\times 60\times 60=$ 432000
Checking option (b) Number of seconds in 1 week $=7\times 24\times 60\times 60$ $=604800$
Checking option (c) Number of minutes in 7 weeks $=7\times 7\times 24\times 60=70560$
Checking option d) Number of hrs. in 60 days $=60\times 24=1440$
Hence, answer is (b)