Answer: 3x-x+2=4
Explanation:
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running distance is 9(t3+0.5)
biking distance is 16 (2(t3+0.5))=16(2t3+1)
swimming distance is 2.5t3
9t3+4.5+32t3+16+2.5t3=64
43.5t3=43.5
t3=1 hour
He biked for 3 hours (48 miles)
He ran for 1.5 hours (13.5 miles)
He swam for 1 hour (2.5 miles)
He covered 62 miles in 5.5 hours of activity.