Advertisements
Advertisements
प्रश्न
If a person travels at a speed of 40 km/h he will reach his destination on time. He covered half the journey in `2/3` of the time. At what speed (in km/h) should he travel to cover the remaining journey to reach the destination on time?
विकल्प
48
50
60
72
Advertisements
उत्तर
60
Explanation:
Let the person reaches his destination in t hours.
then, Half of the distance he has to cover
`=(40xx"t")/2` = 20. t kg.
Remaining time`="t"-2/3"t"="t"/3`hours.
required speed`=(20."t")/(("t"/3))`= 60 km/h
APPEARS IN
संबंधित प्रश्न
Ranjeetha walks around the circular park in 15 minutes. If she walks at the rate of 5 km/hr, how much distance would she have to travel, at the minimum, to reach the centre of the park from any point on its perimeter?
A boat takes 3 hours to travel from place M to N downstream and back from N to M upstream. If the speed of the boat in still water is 4 km/hr, what is the distance between the two places?
Choose the most appropriate option:
A train which is moving at an average speed of 40 kmph, reaches its destination on time. When its average speed reduces to 35 kmph, then it reaches its destination 15 minutes late. The distance travelled by train is:
A train 100 meters long-running at 54 km/hr takes 20 seconds to pass a bridge. The length of the bridge is
An express train travels at an average speed of 120 km per hour, stopping for 4 minutes after every 80 kms. How long will it take the train to reach a destination 960 km away?
Pipe A can fill a tank in 10 hr and Pipe B can fill the same tank in 12 hr. Both the pipes are opened to fill the tank and after 3 hr Pipe A is closed. Pipe B will fill the remaining part of the tank in:
A boat running upstream takes 8 h 48 m to cover a certain distance, while it takes 4 h to cover the same distance running downstream. What is the ratio between the speed of the boat and the speed of the water current respectively?
The ratio of length of two trains is 5 : 3 and the ratio of their speed is 6 : 5. The ratio of time taken by them to cross a pole is
A and B started towards each other at the same time from places 114 km apart and met in 8 hours. If A's rate was 6 kms an hour, what was B's?
A train running at the speed of 108 kmph, crosses a 365 metre long platform in 21 seconds. What is the length of the train?
