If Ram covers a certain journey at 60% of his usual speed, he reaches the destination late by 36 min. His usual time (in min) to reach the destination is:
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 54
Concept used:
If the distance is constant, then speed and time are inversely proportional to each other
Calculations:
Let the usual speed be 5x
Now speed becomes = 60% of 5x = 3x
Ratio of speed = Usual speed : new speed = 5x : 3x
Ratio of time = usual time : new time = 3x : 5x
Difference between the usual and new time = 5x - 3x = 2x
⇒ 2x = 36 mins
⇒ x = 18 mins
Usual time = 3x = 3 × 18 = 54 mins