Question
Aman takes 2 hours to bike from point 'M' to point 'N'
at a speed of 25 km/h. He then increases his speed by 80% and takes 3 hours to reach point 'O' from 'N'. What is Aman's average speed from point 'M' to 'O'?Solution
ATQ,
Distance between point 'M' and point 'N' = 25 × 2 = 50 km
Distance between point 'N' and point 'O' = 25 × 1.8 × 3 = 135 km
Total distance travelled by Aman = 50 + 135 = 185 km
Total time taken by Aman = 2 + 3 = 5 hours
Average speed of Aman = 185 / 5 = 37 km/h
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