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
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Step-by-step explanation:
e) data insufficient
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Answered by
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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...
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