The correct option is D Bike B that travels 288 miles in 8 hours
A.
Bike A that travels 270 miles in 6 hours
Speed of Bike A =Distance coveredTime taken=2706=45 miles per hour
B.
Bike A that travels 288 miles in 8 hours
Speed of Bike B =Distance coveredTime taken=2888=36 miles per hour
C.
Bike A that travels 322 miles in 7 hours
Speed of Bike C =Distance coveredTime taken=3227=46 miles per hour
D.
Bike A that travels 400 miles in 10 hours
Speed of Bike D =Distance coveredTime taken=40010=40 miles per hour
So, Bike B has the lowest speed.