Find the one which does not belong to that group ?  

The least perfect square, which is divisible by each of 21, 36 and 66 is

In a 100 m race, A beats B by 10 m and C by 13 m. In a race of 180 m, B will beat C by:

A man covers half of his journey at 6 km/hr and the remaining half at 3 km/hr. What is his average speed?

The ages of Ram and Sam are in the ratio 4:7 respectively. Four years from now, the ratio of their ages will become 5:8. What is Sam's present age?

The relationship between the first pair of words is the same as the relationship between the second pair of words.

Two trains are moving in the same direction at 72 km/h and 36 km/h. The faster train crosses a person on the slower train in 27 seconds. Find the length of the faster train.

A boat takes 90 minutes less to travel 36 miles downstream than to travel the same distance upstream. If the speed of the boat in still water is 10 mph, the speed of the stream is:

A train leaves Delhi at 9 a.m. at a speed of 30 km/h. Another train leaves at 2 p.m. at a speed of 40 km/h on the same day and in the same direction. How far from Delhi will the two trains meet?

 A walks from points Jammu to Delhi and at the same time B starts walking from Delhi to Jammu. After passing each other, they complete their journeys in 361 hours and 289 hours, respectively. Find the ratio of speed of A to that of B?