A) 24 km/h
B) 54 km/h
C) 81 km/h
D) 72 km/h
Correct Answer: C
Solution :
Speed of B = 36 km/h Time taken \[=7\frac{1}{5}\text{h}\,\text{=}\,\frac{36}{5}\,\text{h}\] Distance = Speed \[\times \] Time \[\left( 36\times \frac{36}{5} \right)\,\text{km}\] \[=\frac{1296}{5}\,km\] Distance between P and \[Q=\frac{1296}{5}\,km\] Time taken by \[A=3\frac{1}{5}\,\text{h}=\frac{16}{5}\text{h}\] Speed = Distance/Time \[=\frac{1296}{5}\times \frac{5}{16}=81\,\text{km/h}\]You need to login to perform this action.
You will be redirected in
3 sec