Answer:
50 units
Step-by-step explanation:
Use long subtraction to evaluate.
Answer:
210 Km
Step-by-step explanation:
Distance travelled is calculated as
distance = speed × time ( time is in hours )
= 90 × 2 
= 90 × 
= 30 × 7
= 210 Km
9.73, or 9.73x10^-3, hope this helped!