Jacob runs 5 miles in 1 1/2 hours Robert runs 3 miles in 45 minutes who runs faster

hence Robert runs at a faster speed

Step-by-step explanation:

1 1/2 hours = 3/2 hours = 1.5 hours

45 min = 45/60 = 3/4 = 0.75 hours

Jacob's speed = 5 miles : 1.5 hours = 3.33 miles/hr

Robert's speed = 3 miles : 0.75 hours = 4 miles/hr

hence Robert runs at a faster speed