Walking at 7/8 of his usual speed, a person reaches his office 10 minutes late. Find his usual time to reach the office. MCQ with Answer and Explanation
A worker handles a total factory delivery run of 160 km. He maps the first 60 km section at 30 km/h and the final 100 km segment section at 50 km/h. Find the mean average speed recorded across the full delivery run.
Explanation:
Total distance = 160 km. Time for section 1 = 60 / 30 = 2 hours. Time for section 2 = 100 / 50 = 2 hours. Total duration time = 4 hours. Average speed across run = 160 / 4 = 40 km/h.
The speeds of two cars are in the ratio 4 : 3. If they cover the same distance, and the slower car takes 2 hours, how much time does the faster car take?
Explanation:
Ratio of speeds = 4:3, so ratio of times taken = 3:4. The slower car corresponds to 4 parts = 2 hours => 1 part = 0.5 hours. Time for the faster car = 3 parts = 3 * 0.5 = 1.5 hours.
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