Adam. 68 5/8. 1:49:48

the pace of Adam in miles per seconds is:

(68 5/8)/(1*60*60 + 49*60 + 48) = 549/6588*8 = 0.67 mi/s

Allen. 58 4/5. 1:36:00

the pace of Allen in miles per seconds is:

(58 4/5)/(1*60*60 + 36*60) = 236/28800 = 0.0082 mi/s

Nigel. 32 3/10. 0:51:00

the pace of Nigel in miles per seconds is:

(32 3/10)/(51*60) = 323/30600 = 0.0105 mi/s

Owen. 44 1/10. 1:12:00

the pace of Owen in miles per seconds is:

(44 1/10) / (1*60*60 + 12*60) = 441/43200 = 0.0102 mi/s

William 54 3/8. 1:27:00

the pace of William in miles per seconds is:

(54 3/8) / (1*60*60+27*60) = 435/41760 = 0.0104 mi/s

Nigel, Owen and William are progressing at the same pace.