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#### Speed, Time and Distance

1.  Walking at 3 of his usual speed, a man reaches 4
his office 20 minutes late. Then his usual time for walking to his office is :
1. 1 hour
2. 30 minutes
3. 45 minutes
4. 40 minutes
##### Correct Option: A

Usual time = x minutes

 New time = 4x minutes 3

 ∵  Speed ∝ 1 Time

According to the question,
 4x − x = 20 3

 ⇒ x = 20 3

⇒  x = 60 minutes i.e. 1 hour.