Answer:
Muhammad biked 64 miles
Explanation:
Olivia biked 8 miles.
Cameron biked 4 times as many miles as Olivia, and Muhammad biked 2 times as many miles as Cameron.
Cameron: 4 x 8 = 32
Cameron biked 32 m.
Muhammad: 32 x 2 = 64
Muhammad biked 64 miles.