Q. Two trains running at x meters per second and y meters per second cross the same tunnel in a seconds and b seconds respectively. If the difference of lengths in the trains is m meters, then-Option
Option
A) m=xa - yb
B) 1/m=1/(xa) + 1/(yb)
C) m=xa + yb
D) m/(xa)=yb + 1Q
A shopkeeper has 13 washing machines out of which 5 are defective. A customer buys 3 washing machine. What is the probability that exactly one machine is defective?
(a) 1/20 (b) 1/5 (c) 70/143 (d) 35/143
Supriya runs a marathon race in 50 minutes at an average speed of 48 km/hrs . in order to set a national record she needs to win the race in 40 minutes considering that her speed remains constant at what minimum speed should she run to set the record?
Q. A car covers a distance of 715 km at a constant speed. If the speed of the car would have been 10 km/hr more, then it would have taken 2 hours less to cover the same distance. What is the original speed of the car?
Option
a) 45 km/hr
b) 50 km/hr
c) 55 km/hr
d) 65 km/hr
Q. In following question, a number series is given with one term missing. Choose the correct alternative that will same pattern and fill in the blank spaces.
2, 3, 5, 7, 11, x, 17