A) \[28\text{ }km/hr.\]
B) \[30\text{ }km/hr.\]
C) \[32\text{ }km/hr.\]
D) \[36\text{ }km/hr.\]
Correct Answer: C
Solution :
Total distance between A and B \[=Speed\times Time=27\times \frac{37}{60}=\frac{27\times 37}{60}km\] Distance between B to C \[=\,\,Speed\times Time=37\times \frac{37}{60}\] \[=\frac{37\times 37}{60}km\] \[\therefore \] Total distance travelled by man \[=\frac{27\times 37}{60}+\frac{37\times 37}{60}=\frac{37}{60}\,(27+37)\] \[=\frac{592}{15}\,km\] Total time taken \[=37+37=74\]minute \[\therefore \] Average speed \[=\frac{Total\text{ }Distance}{Total\,\,time}\] \[=\frac{592}{15}\div \frac{74}{60}=\underline{\mathbf{32}\,\mathbf{km/h}}\]You need to login to perform this action.
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