a) 40 sec b) 42 sec c) 45 sec d) 48 sec Answer: a Explanation: $$\eqalign{ & {\text{Formula}}\,{\text{for}}\,{\text{converting}}\,{\text{from}}\,{\text{km/hr}}\,{\text{to}}\,{\text{m/s:}} \cr & X\,{\text{km/hr}} ...
View QuestionTwo trains of equal length are running on parallel lines in the same direction at 46 km/hr and 36 km/hr. The faster train passes the slower train in 36 seconds. The length of each train is:
a) 50 m b) 72 m c) 80 m d) 82 m Answer: a Explanation: $$\eqalign{ & {\text{Let}}\,{\text{the}}\,{\text{length}}\,{\text{of}}\,{\text{each}}\,{\text{train}}\,{\text{be}}\,x\,{\text{metres}}. ...
View QuestionA train 240 m long passes a pole in 24 seconds. How long will it take to pass a platform 650 m long?
a) 65 sec b) 89 sec c) 100 sec d) 150 sec Answer: b Explanation: $$\eqalign{ & {\text{Speed}} = {\frac{{240}}{{24}}} ...
View QuestionA train 108 m long moving at a speed of 50 km/hr crosses a train 112 m long coming from opposite direction in 6 seconds. The speed of the second train is:
a) 48 km/hr b) 54 km/hr c) 66 km/hr d) 82 km/hr Answer: d Explanation:$$\eqalign{ & {\text{Let}}\,{\text{the}}\,{\text{speed}}\,{\text{of}}\,{\text{the}}\,{\text{second}}\,{\text{train}}\,{\text{be}}\,x\,{\text{km/hr}}. \cr & ...
View QuestionTwo trains of equal lengths take 10 seconds and 15 seconds respectively to cross a telegraph post. If the length of each train be 120 metres, in what time (in seconds) will they cross each other travelling in opposite direction?
a) 10 b) 12 c) 15 d) 20 Answer: b Explanation: $$\eqalign{ & {\text{Speed}}\,{\text{of}}\,{\text{the}}\,{\text{first}}\,{\text{train}} \cr & = {\frac{{120}}{{10}}} \,{\text{m/sec}} \cr & = ...
View QuestionTwo trains are running in opposite directions with the same speed. If the length of each train is 120 metres and they cross each other in 12 seconds, then the speed of each train (in km/hr) is:
a) 10 b) 18 c) 36 d) 72 Answer: c Explanation: $$\eqalign{ & {\text{Let}}\,{\text{the}}\,{\text{speed}}\,{\text{of}}\,{\text{each}}\,{\text{train}}\,{\text{be}}\,x\,{\text{m/sec}}. \cr & {\text{Then,}}\,{\text{relative}}\,{\text{speed}}\,{\text{of}}\,{\text{the}}\,{\text{two}}\,{\text{trains}} = 2x\,{\text{m/sec}} \cr & {\text{So}},\,2x ...
View QuestionTwo goods train each 500 m long, are running in opposite directions on parallel tracks. Their speeds are 45 km/hr and 30 km/hr respectively. Find the time taken by the slower train to pass the driver of the faster one.
a) 12 sec b) 24 sec c) 48 sec d) 60 sec Answer: b Explanation: $$\eqalign{ & {\text{Relative}}\,{\text{speed}} ...
View QuestionHow many seconds will a 500 metre long train take to cross a man walking with a speed of 3 km/hr in the direction of the moving train if the speed of the train is 63 km/hr?
a) 25 b) 30 c) 40 d) 45 Answer: b Explanation: $$\eqalign{ & {\text{Speed}}\,{\text{of}}\,{\text{the}}\,{\text{train}}\,{\text{relative}}\,{\text{to}}\,{\text{man}} \cr & = \left( ...
View QuestionA train moves with a speed of 30 kmph for 12 minutes and for next 8 minutes at a speed of 45 kmph. Find the average speed of the train?
a) 37.50 kmph b) 36 kmph c) 48 kmph d) 30 kmph Answer: b Explanation:$$\eqalign{ & {\text{Distance = Speed }} ...
View QuestionA train which is moving at an average speed of 40 km/h reaches its destination on time. When its average speed reduces to 35 km/h, then it reaches its destination 15 minutes late. The distance traveled by the train is?
a) 70 km b) 80 km c) 40 km d) 30 km Answer: a Explanation:$$\eqalign{ & {\text{Average speed of train}} ...
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