book Maths Puzzle Numerical Ability

A train, an hour after starting, meets with an accident which detains it one hour, after which it proceeds at 3/5 of its former rate and arrives three hours late. But, had the acci

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book Other Question

Given f(x)=4x-3 and g(x)=2x(to the power of 2)-5 find f[g(-1)] and g[f(-1)]. Convert the measure, round your number to the nearest tenth.

65 lb/ft cubed to kg/L (1 kg is about 2.205 lb; 1ft cubed is about 28.3L)
I cannot understand how to preform this