Exam Maths Puzzle Category

f(1)=5
where f(x+y)=f(x)+f(y)
then f(7)=?

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Exam Other Question

what is the value of i power i? A thief flees City A in a car towards City
B on a stretch of straight road, 300 kilometres long, at the speed of 60km/hr. In 15 minutes a police party (X) leaves city A to chase the thief at 65 km/hr.
If a police party (Y) were to leave City B at the same time as police party X leaving City A to catch the thief at 60km/hr., then which of the following statements is true?

1.Party X reaches 37.5 minutes after Party Y has caught the thief.
2.Party Y reaches 37.5 minutes after Party X has caught the thief
3.Party X and Party Y has caught the thief together.
4.Party X was 20 km away when the thief caught.