Question
A train 150 m long crosses a pole in 12 seconds. It also
crosses a platform in 32 seconds. Find the length of the platform.Solution
Speed from pole: Speed = Distance / Time = 150 / 12 = 12.5 m/s Convert to km/h: 12.5 × (18/5) = 12.5 × 3.6 = 45 km/h Let platform length = L. When crossing the platform, distance = 150 + L Time = 32 s ⇒ (150 + L)/32 = 12.5 ⇒ 150 + L = 12.5 × 32 = 400 ⇒ L = 400 − 150 = 250 m Answer: Platform length = 250 m
14 26 ? 558 4432 44270
...8 9 22 75 316 ?
...89Â Â Â Â Â 78Â Â Â Â Â 74Â Â Â Â Â 67Â Â Â Â Â 63Â Â Â Â ?
Three series are given below. You have to find the values of P, Q and R, then establish a relationship among them.
I:Â Â Â 210, P , 233, 64,...
13 15 ? 63 143 293
...112    162    199    ?     242    252
...1240 600 ? 140 90 25
...16Â Â Â 48Â Â Â Â 120Â Â Â Â 240Â Â Â 360Â Â Â ?
6   55   91   116   132    ?  . Â
64   66   70   73   ?   86
Relevant for Exams:
