d Question 27 & 28 | Job Exam Rare Mathematics (JEMrare) - Solved MCQs

# Question 27 & 28

Question 27: A train is 360 m long and is running with speed of 45 km /hr. In how much time it will cross a bridge of length 140 meter?

Solution:

The train will  enter bridge from one end and will cover a distance equal to length of bridge and will reach other end of bridge. Then it will cross bridge completely after covering distance equal to its own length- and then its last boggy will be out from other end !

So, train has to cover total distance equal to its length + length of bridge = 360+140=500 meters;     Using formula;    So, the train will cross the bridge in 40 seconds

Question 28: There are 5 children. Every next child is 3 years older than the previous younger one. If sum of their ages is equal to 50 years find the age of the youngest child.

Solution:

Let age of youngest child is ‘x’; every next child is 3 years elder than previous one – so;     There ages sum;  It is given equal to 50 i-e;    So, the age of the youngest child is 4 years

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