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1. A person travels a certain distance at 3 km / hr and reaches 15 min late. If he travels at 4 km / hr, he reaches 15 min earlier . The distance he has to travel is __
- A. 4.5km
- B. 4.5km
- C. 4.5km
- D. 4.5km
Answer: Option B
Explanation:
Let the time taken to travel at speeds 3 km/h and 4 km/h be t1 and t2 respectively.
So, t1 - t2 = 15 - ( - 15) = 30 minutes = 0.5 h
Now, let the distance travelled be = x km
So, (x / 3) - (x / 4) = 0.5
⇨ x = 6 km.
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