Question

Two trains, Calcutta Mail and Bombay Mail, start at the same time form stations Calcutta and Bombay respectively towards each other. After passing each other, they take 12 hours and 3 hours to reach Bombay and Calcutta respectively. If the Calcutta Mail is moving at the speed of 48 km/h, the speed of the Bombay Mail is

• A. 24 km/h
• B. 22 km/h
• C. 21 km/h
• D. 96 km/h

Answer 1

The correct option is D 96 km/h

in this case $\frac{S_1}{S_2}=\frac{\sqrt{T_2}}{\sqrt{T_1}}=\frac{48}{S_2}=\frac{\sqrt{3}}{\sqrt{12}}=\frac{1}{2}{S}_2=96km/h$