A) 37.5 km/h
B) 36 km/h
C) 48 km/h
D) 30 km/h
Correct Answer: B
Solution :
[b] Distance covered in \[(12\,min+8\,min)\] \[=\left( 30\times \frac{12}{60}+45\times \frac{8}{60} \right)km\] \[=12\,\,km\] Total distance = 12 km, Total time = 20 min \[=\frac{20}{60}h=\frac{1}{3}h\] Average speed \[=\frac{12}{(1/3)}km/h\] \[=36\,km/h\] |
You need to login to perform this action.
You will be redirected in
3 sec