Kate travels a distance of 9 km from her house to the school by autorickshaw at 18 km hr and returns on rickshaw at 15 km/hr. Find the average speed for the whole journey and convert into m/sec.
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Answer:4.54 m/sec
Explanation: avrg speed = total distance/total time
.. so frstly from home to school , distance=speed × time
i.e.→ 9=18×t => t= 1/2 hr
.. similarly from school to home ,
t'=3/5 hr
Total time travelled (T)= t + t'
T= 11/10hr = 1.1 hr
Total distance travelled is 18km (9km+9km)
So avrg speed = 18/1.1 km/hr
To convert km/hr in m/sec multiply by 5/18
So avrg speed = 18/1.1 × 5/18 = 50/11
=> 4.5454 m/sec
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