Question
Rahul takes 5 hours to drive from town 'P' to town 'Q' at a
speed of 50 km/h. He then increases his speed by 20% and takes 3 hours to reach town 'R' from 'Q'. What is Rahul's average speed from town 'P' to 'R'?Solution
ATQ,
Distance between town 'P' and town 'Q' = 50 × 5 = 250 km
Distance between town 'Q' and town 'R' = 50 × 1.2 × 3 = 180 km
Total distance travelled by Rahul = 250 + 180 = 430 km
Total time taken by Rahul = 5 + 3 = 8 hours
Average speed of Rahul = 430 / 8 = 53.75 km/h
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