The task is to generate the correct answer for a given math problem.

Problem: what is the probability of getting a queen or spade from a set of cards ?
4 / 13

Problem: a train covers a distance of 100 km in 1 hour . if its speed is decreased by 10 km / hr , the time taken by the car to cover the same distance will be ?
1 hr 6 min

Problem: the difference between the heights of two trees is 20 cm . 10 years ago , the taller one was thrice as taller as the shorter one . the present height of the taller tree is

300 cm