Question

Four people A, B, C, D start running around a circular
track of length 5 km. Their speeds are 3 km/hr, 3.5
km/hr, 4 km/hr and 7 km/hr respectively. If they
start their run, together from the same point. When
they meet for the first time at the starting point, how
many round would have B completed?
a] 10 hrs, 7 rounds b] 10 hrs, 5 rounds
c] 5 hrs, 3 rounds d] 5 hrs, 7 rounds​

Answer 1

Step-by-step explanation:

Four people A, B, C, D start running around a circular

track of length 5 km. Their speeds are 3 km/hr, 3.5

km/hr, 4 km/hr and 7 km/hr respectively. If they

start their run, together from the same point. When

they meet for the first time at the starting point, how

many round would have B completed?

a] 10 hrs, 7 rounds b] 10 hrs, 5 rounds

c] 5 hrs, 3 rounds d] 5 hrs, 7 rounds

Answer 2

Answer:

a) 10hrs , 7 rounds

Step-by-step explanation:

LCM of time taken = 5hrs but they aren't meeting at the starting point after 5 hrs so add more 5 hrs which will make it 10hrs

so after 10hrs b will complete 35 kms divide it by 5

ans is 7 rounds