A is chasing B in the same interval of time, A jumps 8 times, while B jumps 6 times, But the distance covered by A in 7 jumps is the same as that of B in 5 jumps. The ratio between the speeds of A and B is ________ . |
32 : 24 30 : 56 20 : 21 28 : 36 |
20 : 21 |
7 jumps of A = 5 jumps of B 8 jumps of A = \(\frac{5}{7}\) x8 jumps of B = \(\frac{40}{7}\) jumps of B The required ratio = \(\frac{40}{7}\) : 6 = 40 : 42 = 20 : 21 |