Question

13 came by a fast train @60 km/hr and I'll go back by a slow train @ 40 km/hr. Find the average speed of my journey
(a) 50
(6) 48
(C) 51 (d) 49.4 (e) Data Insufficient

Answer 1

Step-by-step explanation:

e) data insufficient

Tc keep smiling

Answer 2

Answer:

Choose the correct answer: On simplification (a + b)(a - b) - a² + b2 gives :

a) 2a? - 2b2

c) 0

b) 2a2 + 2b2

d) 262

plz answer this problem and who will answer I will mark as brainlist and thanks him...