d Question 9 & 10 | Job Exam Rare Mathematics (JEMrare) - Solved MCQs

# Question 9 & 10

Question 9: A train 260 m long is running at speed of 45 km/hr. In what time will it pass a bridge 140 m long?

FPSC Assistant Director IB 2017

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Solution:

This train will completely cross the bridge after covering distance equal to its length + length of bridge,’ Here distance  = Lenght of train + Length of bridge = 360+140= 400m

Speed V = 45 km/h= 45 X 1000 m/3600 sec= 12.5 m/sec

So,  we have.

S= 400m

v= 12.5m/s

t=?

Using formula;    So the train will cross the bridge in 32 seconds

Question 10: What is the smallest natural number and prime number?

FPSC Assistant Director IB 2017

Solution:

Natural Numbers:

Set of natural numbers is; So, here we can see smallest natural number is 1.

Prime Number :

Prime numbers are those numbers which are divisible by themselves or by 1 — only Here we can see smallest odd prime number is 1, and smallest and the only even prime number is 2.