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
Military camp is having the provisions for 300 people consuming 600 grams daily for 75 days. They are joined by 60 more men and the daily ration was reduced by 100 grams. How long will the provisions last approximately?
A man can row 5 km/h in still water. If the speed of the current is 1 km/h, it takes 3 h more upstream than in the downstream for the same distance. The distance is
A train running at the rate of 40 km/h passes a man riding parallel to the railway line in the same direction at 25 km/h in 48 seconds. Find the length of the train in metres.
A boat takes 90 min less to travel 36 miles downstream than to travel the same distance upstream. If the speed of the boat in still water is 10 m/h, the speed of the stream is
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?
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 man covered a distance of 280 km in 8 hours on a motorcycle. How much distance will be covered on a bicycle in 2 hours, if he rides the bicycle at `3/14` of the speed of the motorcycle?
Two cyclists start simultaneously from two points A and B, their destinations being B and A, respectively. After crossing each other, they precisely take 2 hours 33 minutes 36 seconds and I hour 26 minute 24 seconds respectively to reach their destinations. What is the ratio of the speed of the first to that of the second cyclist?
A train goes from Gandhinagar to Patna at a speed of 128 kmph and returns to Gandhinagar at a different speed. If the average speed for the entire journey is l 12 kmph, then find the speed of the train for the return journey (to nearest kmph)
A bus covers a distance of 180 km at a certain speed. By, increasing the speed by 30 kmph, the bus can reach it's destination an hour before. The original speed of the bus is
