1) How many minutes does Aditya take to cover a distance of 400 m, if he runs at a speed of 20 km/hr ? A) $1\frac{1}{5}$ min B) $1\frac{1}{20}$ min C) $3\frac{1}{5}$ min D) $3\frac{1}{15}$ min E) $3\frac{1}{25}$ min Answer: Option AExplanation:Aditya's speed = 20 km/hr $=\left(20\times\frac{5}{18}\right)$ m/sec $=\frac{50}{9}$ m/sec Time taken to cover 400m $=\left(400\times\frac{9}{50}\right)$ sec = 72 sec $=1\frac{12}{60}$ min $=1\frac{1}{5}$ min