Question

a tortoise moves a distance of 100 metres in 15 minutes.what is the average speed of tortoise in km/h?

Answer 1

Given:
Distance moved =100m=100/1000=0.1km
time=15min=15/60=0.25hr
Formula:
Average Speed= Total Distance/Total Time                           
                          = 0.1/0.25=0.4 Km/hr
Therefore the average speed of tortoise is 0.4km/hr

Answer 2

Given:  Tortoise moves 100 meters in 15 minutes.

Therefore, Average Speed = 100 meters /15 minutes  

(as Speed = Distance/time)

                                                    = 0.10 Km/ 0.25 hours

(as 1 Km = 1000 m and 1 hour = 60 min)

                                                     = 0.4 Km/hour

Answer – The average speed of tortoise is 0.4 Km/hour