Q1. A and B start simultaneously at one end of a swimming pool whose length is 50 m. The swimming race is a Q2. Rupali and Vaishali start from A and B towards B and A respectively. They meet at point C and continue on their way. They take 16 secs and 25 seconds to reach their respective ends from C. If the distance BC is 60 meters, find the distance AB. Q3.There are 3 cities A, B, C. A and B are connected by 3 direct roads. B and C are connected by X direct roads and, A and C by Y direct roads. There are 20 ways of going from A to C without passing through the same routes twice. How many routes are there from B to C if there were minimum number of roads in the scenario Q4. If I travel for one third the distance at a speed of 30 kmph and the rest of the distance at a speed of 75 kmph, what is my average speed? |
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Q4. If I travel for one third the distance at a speed of 30 kmph and the rest of the distance at a speed of 75 kmph, what is my average speed?
a. 50 kmph
b. 52.5 kmph
c. 55 kmph
d. 48 kmph
ans is 50
Little Star
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Q3.There are 3 cities A, B, C. A and B are connected by 3 direct roads. B and C are connected by X direct roads and, A and C by Y direct roads. There are 20 ways of going from A to C without passing through the same routes twice. How many routes are there from B to C if there were minimum number of roads in the scenario
mentioned ?
a. 12
b. 20
c. 28
d. 36
i am getting 12 but another ans also possible
Little Star
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Q2. Rupali and Vaishali start from A and B towards B and A respectively. They meet at point C and continue on their way. They take 16 secs and 25 seconds to reach their respective ends from C. If the distance BC is 60 meters, find the distance AB.
a. 135 meters
b. 108 meters
c. 144 meters
d. None of these
ans is 135 m
Little Star
n/a
Q1.Ans-A covers 1000 mt with the speed of 5m/s.
Given pool is of 50mt so A covers the total distance in 20 laps.
during the time he meets B for 17 times, i,e ones for initially at the start
and then in rase in diffrent 16 laps.
so for the same time B covers 16 laps i,e 16*50=800mt.
therefore 1000/5=800/s(speed of B).
therefore Speed of B=4m/s.
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