A) 25 km/h
B) 28 km/h
C) 30 km/h
D) 33 km/h
Correct Answer: A
Solution :
Let the total distance be 100 km. Average speed \[\text{=}\frac{\text{Total distance covered}}{\text{Time taken}}\] \[=\frac{100}{\frac{30}{20}+\frac{60}{40}+\frac{10}{10}}\] \[=\frac{100}{\frac{3}{2}+\frac{3}{2}+1}=\frac{100}{\frac{3+3+2}{2}}\] \[=\frac{100\times 2}{8}=25\,\text{km/h}\]You need to login to perform this action.
You will be redirected in
3 sec