2. A cyclist rides 24 km at 16 km/h and further 36 km at 15 km/hr. Find his average speed for the journey.
Answers
Answered by
0
Step-by-step explanation:
total distance travelled :
= (24 + 36) km
= 60 km
Total time taken :
=(2416+3615)hrs=(32+125)hrs=3910 hrs=(2416+3615)hrs=(32+125)hrs=3910 hrs
∴ Average speed :
=(60×1039)km/hr=(20013)km/hr=15.38 km/hr
Answered by
0
Answer & Step-by-step explanation:
(one may think that finding the average speed is the sum of the 2 speeds and divide it by 2 [16 + 15 / 2 = 15.5] this is a wrong working although it might be closer to the correct answer.)
CORRECT METHOD
find the time taken in each case
distance = speed x time
24 = 16 x t
t = 1.5 hours
36 = 15 x t
t = 2.4 hours
total distance = 24 + 36 = 60
total time = 1.5 + 2.4 = 3.9 hours
USE THE FORMULA;
Average speed = total distance / total time taken
Average speed = 60 /3.9
Average speed = 15.38 = 15.4 Km/hr
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