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Ram walks at a speed of 10 km/h. Today the day was very hot so he walked at 2/5th of his average speed. He arrived at his school 18 minutes late. Find the usual time he takes to cover the distance between his school and home?
1. 12 min
2. 15 min
3. 18 min
4. 10 min

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Correct Answer - Option 1 : 12 min

GIVEN:

Ram walks at a speed of 10 km/h. Today the day was very hot so walked at 2/5th of his average speed. He arrived at his school 18 minutes late.

FORMULA USED:

Time = Distance/Speed

CALCULATION:

Suppose the distance between his school and home = X km

Decreased speed = 10 × 2/5 = 4 kmph

According to the question:

X/4 - X/10 = 18/60 = 3/10

⇒ X = 2 km

So,

Usual time he takes to cover the distance between his school and home = 2/(10/60) = 12 min

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