A person cycling at a speed of 24 kmph reaches college from hostel 11 minutes late. If he cycled at a speed of 30 kmph, he would have reached 8 minutes early. Find the distance between the hostel and college?

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RPF SI (2018) Official Paper (Held On: 19 Dec 2018 Shift 3)
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  1. 24 km
  2. 28 km 
  3. 38 km
  4. 36 km 

Answer (Detailed Solution Below)

Option 3 : 38 km
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Detailed Solution

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Formula Used:

Distance = Speed × Time

Calculation:

Let the distance between the hostel and college be D km.

Time taken at 24 kmph = D / 24 hours

Time taken at 30 kmph = D / 30 hours

According to the given conditions:

⇒ (D / 24) - (D / 30) = (11 + 8) / 60

⇒ (D / 24) - (D / 30) = 19 / 60

Finding a common denominator for the fractions:

⇒ (5D - 4D) / 120 = 19 / 60

⇒ D / 120 = 19 / 60

⇒ D = 19 × 2

⇒ D = 38 km

∴ The distance between the hostel and college is 38 km.

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