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?
पर्याय
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
A car driver increases the average speed of his car by 3 km/hr every hour. The total distance travelled in 7 hours if the distance covered in the first hour was 30 km, is
Solve the following question and mark the best possible option.
A boat travels upstream from B to A and downstream from A to B in 3 hours. If the speed of the boat in still water is 9 km/hr and the speed of the current is 3 km/hr, the distance between A and B(in km) is
Azhar can row 9.333 kmph in still waters and finds that it takes him thrice as much time to row up than as to row down the same distance in the river. The speed of the current of the river is
A clock gains 5 minutes every hour. Then the angle traversed by the second's hand in one minute will be
A student rides a bicycle at 8 kms/hr and reaches the school 2.5 minutes late. The next day he increases the speed to 10 kms/hr and reaches school 5 minutes early. How far is the school from his house?
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
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.
A goods train is 800 meters long and it is running at a constant speed of 60 km/per hour. If it takes 120 seconds to pass a bridge, then calculate the length of the bridge?
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?
