Write a letter to your friend arranging for an excursion together

Find the number of ways in which the letters of word 'MEDICAL' be arranged if A and E are together but all the vowels never come together.

A person writes letters to six friends and addresses the corresponding envelopes.In how many ways can the letters be placed in the envelopes so that

Mohan and his friend was travelling together.

The letters of the word PROMISE are arranged so that no two of the vowels should come together.Find the total number of arrangements,