A person takes 40 minutes more than his usual time when he covers a distance of 20 km at 5 km/h. If he covers the same distance at 8 km/h, he takes x minutes less than the usual time. What is the value of x?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 50
| Understanding/Application |
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Given, Distance = 20 km Speed1 = 5 km/hr Speed2 = 8 km/hr When with speed1: Time = Distance/speed1 = 20/5 = 4 hr i.e 40 min more [from question] Actual time = 4 hours - 40 min = 3 hours 20 minutes Now, Time2 = Distance/Speed2 = 20/8 = 2 hours 30 min i.e x min early [from question] Hence, x min = (3 hours 20 minutes) - (2 hours 30 min) = 50 minute or x = 50. |