Question

rectangular field is 150 m x 60 m two cyclist Anand and Rajan start together and can cycle at the speed of 21 m per minute and 28 m per minute respectively they cycle along the rectangular track around the field from the same point and at the same moment after how many minutes will they meet again at the starting point

Answer 1

As S=D/T
So, Anand 
21 = 420 (perimeter of park)/T
So, time = 20 minutes

Rajan,
28= 420/T
SO, T = 15
So, they will meet : At the LCM of 20 and 15
Which is = 60 minutes
Ans; They will meet after 60 minutes OR 1hour

Hope it helps

Answer 2

Answer:

60min or 1 hour

Step-by-step explanation:

HCF of speed of both cyclist i.e, HCF of 21 & 28 is 7m/min.

Therefore, Speed= dist / time

→ 7m/min= 2(150+60)/time

→ time = (2*210/7) min

→ time = (2*30) min

→ time = 60 min or 1 hour.←Answer.

Thank you.