A block 'A' takes 2 s to slide down a frictionless incline of 30∘ and length 'l', kept inside a lift going up with uniform velocity 'v'. If the incline is changed to 45∘, the time taken by the block, to slide down the incline, will be approximately:
(a) 2.66 s
(b) 0.83 s
(c) 1.68 s
(d) 0.70 s