A) \[{{v}_{av}}>25km/h\]
B) \[{{v}_{av}}<25km/h\]
C) \[{{v}_{av}}=25km/h\]
D) Information is insufficient
Correct Answer: B
Solution :
Time interval for which speed is\[20km/h\] \[={{t}_{1}}=\frac{15}{20}=0.75\,\,h\] Time interval for which speed is 30 km/h \[={{t}_{2}}=\frac{20}{30}=0.667\,\,h\] Using formula,\[{{v}_{av}}=\]total distance/total time \[=\frac{(20+15)}{\left( \frac{15}{20}+\frac{20}{30} \right)}\]
You need to login to perform this action.
You will be redirected in
3 sec
