It took Malcom 3.5 hours to drive from city A to city B. On his way back to city
A, he increased his speed by 20 km per hour and it took him 3 hours.
a) Find the average speed for the whole journey

• ans 50km/hr
  let distance d=s*3.5---- i
  from B to A d=(s+20)*3----- ii
  solving i and ii
  s=40
  from B to A s=60
  average 50. so ans is 50km/hr
  
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