| A man walks 7.5 km at a speed of 3 km/h. At what speed would the man need to walk during the next 2 h to have an average of 4 km/h for the entire session? |
A) 3.65 km/h
B) 4.75 km/h
C) 5.25 km/h
D) 6.50 km/h
Correct Answer: C
Solution :
(c)| Let speed of walking be x km/h. |
| Total time taken \[=\frac{7.5}{3}+2=4.5\,\,h\] |
| Total distance covered \[=7.5+2x\] |
| \[\therefore \] \[\frac{7.5+2x}{4.5}=4\] |
| \[\Rightarrow \] \[7.5+2x=18\]\[\Rightarrow \]\[2x=10.5\] |
| \[\therefore \]Speed of walking \[=5.25\,\,km/h\] |
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