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By walking at 5/6 of usual speed Tejswi reaches her office 15 minutes late than her usual time. What is the usual time taken by her to reach office?

By walking at 5/6 of usual speed Tejswi reaches her office 15 minutes late than her usual time. What is the usual time taken by her to reach office? Correct Answer 75 minutes

Given: 

She walks =  5/6 of the usual speed

Tejswi reaches the office late by 15 minutes

Formula Used:

Distance = Speed × Time

Calculation:

Usual Speed ∶ Change speed

⇒ 1 ∶ 5/6

⇒ 6 ∶ 5

Usual time ∶ Change time

⇒ 5 ∶ 6

⇒ 1 unit of time (6 - 5) = 15 minutes

⇒ 5 units = 15 × 5 = 75 minutes

∴ The usual time taken by her to reach the office is 75 minutes.

The correct option is 2 i.e. 75 minutes

If the distance is the same then the ratio of time is reverse of the ratio of speed. 

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