A) 10 km/hr |
B) 12 km/hr |
C) 14 km/hr |
D) 15 km/hr |
A) 10 km/hr |
\( \Large \left(v_{1}+v_{2}\right)t_{1} = \left(v_{1}-v_{2}\right)t_{2} \)
Therefore, \( \Large \left(v_{1}+2\right) \times 6 = \left(v_{1}-2\right) \times 9 \)
\( \Large v_{1} = 10 km/hr \)