Chemistry-Activation Energy?

so i have a problem understanding the relationship between the activation evnery and the delta E. how would i go about solving this problem, thanks alot!

[The activation energy for the following reaction is 125 kJ/mol, and E for the reaction is -216 kJ/mol.

NO2(g) + CO(g) NO(g) + CO2(g)
What is the activation energy for the reverse reaction [NO(g) + CO2(g) NO2(g) + CO(g)]? ]

Answer:
if for the forward reaction it is exothermic, then the activation energy for the reverse reaction will be the difference of deltaE and activation energy. So, the answer is 341 kj/mol

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