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Option 4 : 80
Parvez’s speed = 40 km/h, Parvez’s time = 16 h
Gautam’s time = 4 h, Gautam’s speed = x
Formula, s1/s2 = √(t2/t1)
⇒ 40/x = √(4/16)
⇒ 40/x = 1/2
⇒ x = 80 km/h
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