Question

If a train travel from Addis Ababa to Dire Dawa at a constant velocity of 400Km/hr and the to Djibouti at a constant velocity of V. if the average velocity of 520Km/hr then what is the value of V?----------------

Answer 1

640 km/h

Step-by-step explanation:

I havent studied this in a long time but i would assume that

(400 + V)/2 = average

= 520 km/h

times both sides by 2

400 + V = 1040

V =640