correct answer is: a) 3 hours

Explanation

In the speed of KaTeX parse error: KaTeX doesn't work in quirks mode. km/hr a man can travel KaTeX parse error: KaTeX doesn't work in quirks mode. km.
We know,
Time KaTeX parse error: KaTeX doesn't work in quirks mode.
KaTeX parse error: KaTeX doesn't work in quirks mode. The time taken a man to cover the distance is KaTeX parse error: KaTeX doesn't work in quirks mode.
KaTeX parse error: KaTeX doesn't work in quirks mode. Time KaTeX parse error: KaTeX doesn't work in quirks mode.
KaTeX parse error: KaTeX doesn't work in quirks mode. hours.
Ans: The time taken by a man is KaTeX parse error: KaTeX doesn't work in quirks mode. hours.

An additional variation of this particular math query can be considered:

1. How many hours does it take for a man to ride a cycle covering a distance of 75 km at a consistent speed of 15 km per hour?
2. Calculate the duration required by a man to ride a cycle covering a distance of 75 km at a speed of 15 km per hour.
3. Determine the time taken by a man to travel 75 km on a cycle moving at a constant speed of 15 km per hour.
4. Find out how long it takes for a man to ride a cycle covering a distance of 75 km at a speed of 15 km per hour.
5. What is the total time needed for a man to travel 75 km on a cycle if he maintains a speed of 15 km per hour?