\Train A is moving along two parallel rail tracks towards north with speed 72 km/h and train B is moving towards south with speed 108 km/h. Velocity of train B with respect to A and velocity of ground with respect to B are $\left(\right.$ in $\left.\mathrm{ms}^{-1}\right)$:
Select the correct option:
A
-30 and 50
B
-50 and -30
C
-50 and 30
D
50 and -30
✓ Correct! Well done.
✗ Incorrect. Try again or view the solution.
Solution
$$
\begin{aligned}
V_A & =20 \mathrm{~m} / \mathrm{s} \\
V_B & =-30 \mathrm{~m} / \mathrm{s}
\end{aligned}
$$
Velocity of B w.r.t. A
$$
\mathrm{V}_{\mathrm{B} / \mathrm{A}}=-50 \mathrm{~m} / \mathrm{s}
$$
Velocity of ground w.r.t. B
$$
\mathrm{V}_{\mathrm{G} / \mathrm{B}}=30 \mathrm{~m} / \mathrm{s}
$$
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