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Decade counter is a synchronous  term for BCD counter that counts the BCD digits from 0 - 9 and hence the mod value of               decade counter = 10

Hence the frequency will be divided by 10 if we have a decade counter.

Given input frequency = 640 KHz

After going through 4 bit ring counter , we have = 640 / 4  = 160 KHz(As mod value of n bit ring counter is n)

After going through 4 bit Johnson counter we have = 160 / 8  =  20 KHz(As mod value of n bit Johnson counter is 2n)

After going through the decade counter finally, we have = 20 / 10 = 2 KHz

Thus the final output frequency = 2 KHz

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Input frequency =640 KHz

after passing through 4-bit ring counter output frequency=640/4=160 KHz  (In ring counter if there are n flip flops there will be n states)

after passing through 4-bit Johnson counter output frequency=160/2*4=20 KHz  ( In johnson counter if there are n flip flops there will be 2n states)

after passing through decade counter output frequency=20/10=2 KHz

Ans: 2 KHz

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