John can clean an Olympic size swimming pool in 8 hours. Peter can finish the same job in 10 hours. How long will it take if John and Peter will clean an Olympic size swimming pool together?

The second term of an arithmetic sequence is 30. the fifth term is 90.calculatei). the commor difference of the sequence ii). the first term of the sequence tje first, second and fifth terms of the arithmetic sequence are the first three terms of a geometric sequence calculate the seventh term of the geometric sequence