A 300-meter train takes 39 seconds to cross a platform and 18 seconds to traverse a signal pole. What is the platform's length?
A. 320 m
B. 350 m
C. 650 m
D. Data inadequate
Answer:B
A 300-meter train takes 39 seconds to cross a platform and 18 seconds to traverse a signal pole. What is the platform's length?
A. 320 m B. 350 m C. 650 m D. Data inadequate
Explanation: Speed equals ( 300/18 ) m/sec, which equals 50/3 m/sec. Let the platform's length be x metres.Then ( x + 300/39 ) = 50/3, which equals 3(x + 300) = 1950, which equals x = 350 m.