Table:
0
A
B
C
D
E
1
Line
Speed
Length
Construction begun
Expected start of revenue services
2
Svilengrad -Turkish Border
200km/h
19km
2010
2012
3
Dimitrovgrad - Svilengrad
200km/h
70km
2012
2013
4
Plovdiv - Burgas
200km/h
291km
2010
2013
5
Sofia - Plovdiv
200km/h
156km
2010
2015
6
Sofia - Radomir
200km/h
53km
2014
2017
7
Sofia - Dragoman
200km/h
44km
2014
2017
8
Vidin - Sofia
200km/h
222km
Unknown
2020

Questions and formulas:
Question: What is the Speed when Construction begun in 2010, and an Expected start of revenue services of 2015?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,(D1=2010)*(E1=2015)),2))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E8,(D2:D8=2010)*(E2:E8=2015)),2))
Level: medium
Question: What is the length when the expected start of revenue is more than 2017?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,E1>2017),3))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E8,E2:E8>2017),3))
Level: medium