Ques:- Two trains 140 m and 160 m long run at the speed of 60 km/hr and 40 km/hr respectively in opposite directions on parallel tracks. The time which they take to cross each other is?
Ques:- A can run a kilometer race in 4 1/2 min while B can run same race in 5 min. How many meters start can A give B in a kilometer race, so that the race mat end in a dead heat?
A can give B (5 min – 4 1/2 min) = 30 sec start.
The distance covered by B in 5 min = 1000 m.
Distance covered in 30 sec = (1000 * 30)/300 = 100 m.
A can give B 100m start.
Ques:- Four bells begin to toll together respectively at the intervals of 8, 10, 12 and 16 seconds. After how many seconds will they toll together again?
Ques:- Ramu rides his bike at an average speed of 45 km/hr and reaches his desitination in four hours. Somu covers the same distance in six hours. If Ramu covered his journey at an average speed which was 9 km/hr less and Somu covered his journey at an average speed which was 10 km/hr more, then the difference in their times taken to reach the destination would be (in minutes).
Right Answer: The difference in their times taken to reach the destination would be 30 minutes.
Comments
RinkiMar 29, 2025
ramu speed=45km/hr
ramu time= 4hr
total distance=45*4=180km
somu time=6hr
somu speed=180/6=30km/hr
ramu new speed=45-9=36km/hr
ramu new time=180/36=5hr
somu new speed=40km/hr
some new time=180/40=4.5hr
difference in time=30 min
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