Question

a taxi driver noted the reading on the odometer as 11185 km when he started the journey .after 30 minutes drive, he noted that the odometer reading is 11200 km. find the average speed

Answer 1

Distance traveled = (11200-11185) km = 15 km
Time taken = 30 minutes = 30/60 hr = 0.5 hr
Speed = Distance/Time = 15/0.5 = 30 km/hr

Answer 2

distance traveled by the driver =11200-11185
                                             =15 km
time taken to travel 15 km of distance = 30 min
                                                        = $\frac{1}{2}$ hours
speed = $\frac{distance}{time}$
speed = $\frac{15}{ \frac{1}{2} }$
speed = 15 × 2
speed = 30 km/h
converting into m/sec
                                = 15 × $\frac{5}{18}$
                                = 8.35 m/s