AIEEE 2005 Physics Solved Paper

When two tuning forks (fork 1 and fork 2 ) are sounded simultaneously, 4 beats per second are heated. Now, some tape is attached on the prong of the fork 2 . When the tuning forks are sounded again, 6 beats per second are heard. If the frequency of fork 1 is 200‌Hz, then what was the original frequency of fork 2 ?