Sir i am stuck for this question

Question 1 _ Assume that the weights of women follow a Normal distribution with mean 68kg and standard deviation 18kg. Similarly. assume the weights of men follow a Normal distribution with mean 82kg and standard deviation 15kg. Rachel and John are sailing in a raft. Rachei's equipment in the raft weighs 20% of her weight. John's equipment weighs 50% of his weight. In rough waters the raft will sink if the total weight of pe0p|e plus equipment it carries is greater than 170kg. Compute the probability that Rachel and John will not sink, showing all your workings and defining all notation (assume that the weights of Rachel and John are sampled independently from the relevant distributions). Express your answer as a function of 4b