4. A person reaches his destination 10 minutes late if his speed is 15 km/hr, and reaches 5 minutes before time if his speed is 20 km/hr. Find the distance from starting point to destination?
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Answer:
15 km
Step-by-step explanation:
Let the distance be x km
Time taken when speed was 15 km/hr:
Time = Distance/Speed = x/15 hr
Time taken when speed was 20 km/hr:
Time = Distance/Speed = x/20 hr
Difference between both times = 5 min + 10 min
x/15 – x/20 = 15 min
(4x – 3x)/60 = 15/60 hr.
x = 15 km
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