How many seconds does Puja take to cover a distance of 500 m, if she runs at a speed of 30 km/hr?
Choose the correct choice from the following answers
A) 60 sec B) 82 sec C) 95 sec D) 100 sec E) 120 sec

Rationale: hint : time = distance / speed we see that the distance is given in metres while the speed is given in km / hr and the answer is asked in seconds . so , convert km / hr into m / s by multiplying 5 / 18 m / s to the given value of speed . 30 km / hr = 30 x 5 / 18 = 75 / 9 m / sec i . e . place these values in the formula : time = 500 x 9 / 75 = 60 sec answer is a
Answer: A