help me on both questions as attached below.
Also it's workings on how to get that if possible

Answer:
a) 160km
b) it will take 3.2 hours or 192 minutes or 3 hours and 12 minutes
Step-by-step explanation:
a) d=speedxtime
so, 64x2. 5=160km
b) time=d/s
so, 160/50
it will take 3.2 hours or 192 minutes or 3 hours and 12 minutes