A) 3 km/h |
B) 4 km/h |
C) 4.5 km/h |
D) 9 km/h |
B) 4 km/h |
Given, A = 6 km/h, B = 3 km/h
According to the formula, \( \Large \frac{2AB}{A+B} \)
Required average speed
= \( \Large \frac{2 \times 6 \times 3}{6+3} = \frac{36}{9} = 4 km/h \)