Question

select an appropriate unit from the choices below and connect the rate to that unit.

answer a - ft /s
answer b - mph
answer c - mm/s
answer d - km/s

question : A person walking at 3,4 mph

Answer 1

c and d would be very unwieldy. However, you do know (I hope) that 60 mph = 88 ft/s

That's probably a good conversion to use.