A person crosses a 900-metre long street in 6 minutes. The speed of the person, in km/h, is:
Show answer & explanation
Correct answer: B
Explanation
The correct answer is Option 2 i.e. 9.
Distance = 900 m
⇒ 900/1000 = 0.9 km
Time = 6 minutes
⇒ 6/60 = 1/10 hr
Speed = Distance/Time = 0.9/(1/10) = 0.9 × 10 = 9