Question

A man walks his dog daily for 15 minutes on pathway of 1.8 km. How much time will dog take if its speed increases by 3 m/s?
1. 3 minutes
2. 6 minutes
3. 5 minutes
4. 4 minutes

Answer 1

Correct Answer - Option 2 : 6 minutes

Given:

T = 15 minutes

D = 1.8 km

S₂ = S₁ + 3

Formula used:

Speed = Distance/Time

Calculation:

T = 15 minutes

⇒ T = 900 seconds

D = 1.8 km

⇒ D = 1800 m

S₁ = 1800/900

⇒ S₁ = 2 m/s

S₂ = 2 + 3

⇒ S₂ = 5 m/s

⇒ T = 1800/5

⇒ T = 360 s

⇒ T = 6 minutes

∴ Dog will take 6 minutes to complete the walk