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
In a 100 meters race, A beats B by 20 meters B beats C by 5 meters. In the same race, A beats C by:
Two taps ‘A’ and ‘B’ can fill a water reservoir in 8 and 6 hours respectively. A third tap ‘C’ can empty the tank completely in 24 hours. How long would it take to fill the empty tank when all the taps are open?
A person covers a certain distance by car at a speed of 30 km/h and comes back at a speed of 40 km/h. The average speed during the travel is
A person crosses a 600m long street in 5 min. What is his speed in km per hour?
If a person walks at 14 km/h instead of 10 km/h, he would have walked 20 km more. The actual distance travelled by him is
Excluding stoppages, the speed of a bus is 54 km/h and including stoppages, it is 45 km/h. For how many minutes does the bus stop per hour?
A train moving with uniform speed crosses a pole in 2 s and a 250 m long bridge in 7 s. Find the length of the train.
Two trains running in opposite directions cross a man standing on the platform in 27 sec and 17 sec, respectively and they cross each other in 23 sec. The ratio of their speeds is
A person covers 40% of the distance from A to B at 8 km/ h, 40% of the remaining distance at 9 km/h and the rest at 12 km/h. His average speed (in km/h) for the journey is:
A train travels 500 m in first minute. ln the next 4 minutes, it travels in each minute 125 m more than that in the previous minute. The average speed per hour of the train during those 5 minutes will be
