Quiz Discussion

A bus covers three successive 3 km stretches at speed of 10 km/hr, 20 km/hr and 60 km/hr respectively. Its average speed over this distance is :

Course Name: Java

  • 1] 30 km/hr
  • 2] 25 km/hr
  • 3] 18 km/hr
  • 4] 10 km/hr
Solution
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# Quiz
1
Discuss

A car travels from P to Q at a constant speed. If its speed were increased by 10 km/hr, it would have taken one hour lesser to cover the distance. It would have taken further 45 minutes lesser if the speed was further increased by 10 km/hr. The distance between two cities is :

  • 1] 540 km
  • 2] 420 km
  • 3] 600 km
  • 4] 620 km
Solution
2
Discuss

A 6 × 6 grid is cut from an 8 × 8 chessboard. In how many ways can we put two identical coins, one on the black square and one on a white square on the grid, such that they are not placed in the same row or in the same column?

  • 1] 216 ways
  • 2] 324 ways
  • 3] 144 ways
  • 4] 108 ways
Solution
3
Discuss

The speed of two trains are in the ratio 6 : 7. If the second train runs 364 km in 4 hours, then the speed of first train is :

  • 1] 60 km/hr
  • 2] 72 km/hr
  • 3] 78 km/hr
  • 4] 84 km/hr
Solution
4
Discuss

Two trains 105 meters and 90 meters long, run at the speeds of 45 kmph and 72 kmph respectively, in opposite directions on parallel tracks. The time which they take to cross each other, is:

  • 1] 8 seconds
  • 2] 6 seconds
  • 3] 7 seconds
  • 4] 5 seconds
Solution
5
Discuss

Amit starts from a point A and walks to another points B and then returns from B to A by his car and thus takes a total time of 6 hours and 45 min. If he had driven both ways in his car, he would have taken 2 hours less. How long would it take for him to walk both ways ?

  • 1] 7 hrs 45 min
  • 2] 8 hrs 15 min
  • 3] 8 hrs 30 min
  • 4] 8 hrs 45 min
Solution
6
Discuss

A man can row 15 km/h in still water and he finds that it takes him twice as much time to row up than as to row down the same distance in the river. The speed of current (in km/h) :

  • 1] 6 km/h
  • 2] 6.5 km/h
  • 3] 4.5 km/h
  • 4] 5 km/h
Solution
7
Discuss

A boy is running at a speed of p kmph to cover a distance of 1 km. But, due to the slippery ground, his speed is reduced by q kmph (p > q). If he takes r hours to cover the distance, then:

  • 1]

    \(\frac{1}{r} = p - q\)

  • 2]

    r = p - q

  • 3]

    \(\frac{1}{r} = p + q\)

  • 4]

    r = p + r

Solution
8
Discuss

Rohan, Shikha's boyfriend, had to pick her from her home for a live concert on her 23rd birthday. The venue of the concert and Shikha's home were in opposite directions from Rohan's office. He got late because of some work at office and realised that if he goes to pick Shikha from her home, which was a 48-minute drive from his office, they would be late for the show by 16 minutes. He asked her to start from her home towards his office in an auto-rickshaw and himself started driving towards her home. Both of them started simultaneously, he picked her as soon as they met and they managed to reach the venue just in time for the concert. If Rohan drives at an average speed of 60 km/hr, find the speed (in km/hr) of the auto-rickshaw.

  • 1] 16 km
  • 2] 20 km
  • 3] 12 km
  • 4] 15 km
  • 5] None of these
Solution
9
Discuss

Deepa rides her bike at an average speed of 30 km/hr and reaches her destination in 6 hours. Hema covers the same distance in 4 hours. If Deepa increases her average speed by 10 km/hr and Hema increases her average speed by 5 km/hr, what would be the difference in their time taken to reach the destination ?

  • 1] 40 min
  • 2] 45 min
  • 3] 54 min
  • 4] 1 hr
  • 5] None of these
Solution
10
Discuss

Two trains started at the same time, one from A to B and other from B to A. if they arrived at B and A respectively in 4 hours and 9 hours after they passed each other, the ratio of the speeds of the two trains was:

  • 1] 2 : 1
  • 2] 3 : 2
  • 3] 4 : 3
  • 4] 5 : 4
Solution
# Quiz