Question
A motorist is traveling at 72 km/h and expects to
complete his journey in 1.25 hours. After reaching halfway, he halts for 15 minutes. What should be his speed for the remaining part?Solution
Total distance = 72 × 1.25 = 90 km
Time for half = (45 ÷ 72) × 60 = 37.5 minutes
Time left = 75 – 37.5 – 15 = 22.5 minutes
Required speed = (45 ÷ 22.5) × 60 = 120 km/h
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