A person rows 18 km downstream in 2 hours and covers the same distance upstream in 6 hours. What is the speed of the boat in still water? MCQ with Answer and Explanation
A modern speedboat records a speed of 18 km/h in still water. It spans a specific upstream reach in 5 hours. If the current velocity is 4 km/h, find the reach distance.
Two marathoners run a long stretch. The winner finishes in 50 minutes while the second runner takes 55 minutes. By what percentage is the winner's speed higher than the runner-up's speed?
Explanation:
Since distance is constant, speed is inversely proportional to time. Ratio of times Winner:Runner-up = 50:55 = 10:11. Ratio of speeds Winner:Runner-up = 11:10. Speed excess percentage = ((11 - 10) / 10) * 100 = 10%.
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