In how ways can the selection be made so that a particular member is always included?
As the person is always included, therefore, ∴ C_1 × 10C_4 = 1 × (10 × 9 × 8 × 7)/(4 × 3 × 2) = 210
Ratio of speeds of ‘A’ and ‘B’ is 2:3, respectively. If they participate in a 450-metre race and ‘B’ gives ‘A’, ahead start of ‘m’ m...
How many km per hour does a man walk who passes through a street 1400 m long in 12 minutes?
The tops of two poles of height 60 metres and 35 metres are connected by a rope. If the rope makes an angle with the horizontal whose tangent is 5/9 met...
‘A’ and ‘B’ started moving towards each other at same time with a speed of 24 km/hr and 10 km/hr, respectively. If the di...
A man travels a certain distance at 12 km/h and returns to the starting point at 9 km/h. The total time taken by him for the entire journey 2 (1/3) hour...
Sheetal rides a bike at an average speed of 40 kmph and reaches her destination in 5 hours. Hemlata covers the same distance in 4 hrs. If Sheetal increa...
X started to run from point ‘A’ to ‘B’ at a speed of 23 km/hr at 9:00 am and Y started to run from point ‘B’ to ‘A’ at a speed of 20 km/...
Speed of a car and a bus is 20 km/h and 10 km/h, respectively. If the time taken by the car to cover a distance of ‘9x’ km is 4 hour less than time ...
A train has to cover a distance of 350 km in 25 hours. If it covers half journey in 3/5th time, then the speed of covering the remaining dist...
A man travels some distance at a speed of 32 km/hr and returns at a speed of 24 km/hr. If the total time taken by him is 2 hrs 20 min, the distance is
