Advertisements
Advertisements
प्रश्न
Two trains, one from Howrah to Patna and other from Patna to Howrah start simultaneously. After they meet, the trains reach their destinations after 9 hours and 16 hours respectively. The ratio of their speed is.
विकल्प
2 : 03
4 : 03
6 : 07
9 : 06
Advertisements
उत्तर
4: 03
Explanation:
When train reach after they met in t1 and t2 hr
`("Speed of train I")/("Speed of train II")=sqrt("t"_1/"t"_2)=sqrt(16/9)=4:3`
APPEARS IN
संबंधित 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?
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
The Bubna dam has four inlets. Through the first three inlets, the dam can be filled in 12 minutes; through the second, the third and the fourth inlet, it can be filled in 15 minutes; and through the first and the first inlet, in 20 minutes. How much time will it take all the four inlets to fill up the dam?
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 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 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 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 man crosses a road 250 metres wide in 75 seconds. His speed in km/hr is :
A truck covers 448 km in 8 hours. The average speed of a bicycle is `1/4` th of the average speed of the truck. How much distance will the bicycle cover in 7 hours?
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?
