1.  In how many minutes will Samir cover a distance of 800 m, if he runs at speed of 10 km/hr?
A. 5 min
B. 4 min 48 sec
C. 4 min 40 sec
D. 5 min 12 sec

Answer: Option B

Explanation:

samir's speed = 10 Km/hr
                     = (10 x 5/18) m/sec
                     = 50/18 m/sec

Time taken to cover 800 m = (800 / (50/18) ) sec
                                       = (800 x 18/50) sec
                                       = 288 sec
                                       = 4 min 48 sec