4. A and B walk around a circular track. They start at 9a.m.from the s

1.	4. A and B walk around a circular track. They start at 9a.m.from the same point in the opposite directions. A and Ewalk at a speed of 2 rounds per hour and 3 rounds perhour respectively. How many times shall they cross eachother before 9.30 a.m.?A, 810B. 7D. 5
Answer» Let us find their respective speed. - Respective speed = Total speed of A + Total speed of B = 2 + 3 = 5 So respective speed or relative speed is equal to 5 rounds \ hr. ⇒ So by this statement we derive that A and B cross 5 times. ⇒Hence we can say that A And B cross 5 times in only 1 hr. A and B cross 2 times in 1 \ 2 hrs Time lapse between 8 a.m and 9.30 a.m is 1.5 hrs. No. of times did A and B cross in 1 hr +No. of times did A and B cross in 1 \2 hrs = ⇒ 5 + 2 = 7 hrs

4. A and B walk around a circular track. They start at 9a.m.from the same point in the opposite directions. A and Ewalk at a speed of 2 rounds per hour and 3 rounds perhour respectively. How many times shall they cross eachother before 9.30 a.m.?A, 810B. 7D. 5

Answer»

Let us find their respective speed. -

Respective speed = Total speed of A + Total speed of B

= 2 + 3 = 5

So respective speed or relative speed is equal to 5 rounds \ hr.

⇒ So by this statement we derive that A and B cross 5 times.

⇒Hence we can say that A And B cross 5 times in only 1 hr.

A and B cross 2 times in 1 \ 2 hrs

Time lapse between 8 a.m and 9.30 a.m is 1.5 hrs.

No. of times did A and B cross in 1 hr +No. of times did A and B cross in 1 \2 hrs =

⇒ 5 + 2 = 7 hrs