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Riya’s speed= 50 km/hr. Time taken by Riya = 6 hrs. Distance = Speed × Time = 50 × 6 = 300 km. ∴ Distance covered by Himani = 300 km. Time taken by Himani = 5 hrs. ∴ Himani’s Speed = (Distance )/Time = (300 )/5 = 60 km/hr. Riya’s increased speed= 60 km/hr. ∴ Time taken by Riya = (300 )/60 = 5 hrs. Himani’s increased speed = 80 km/hr. ∴ Time taken by Himani = (300 )/80 = 3*3/4 hrs. = 3hrs 45 minutes. ∴ Required difference = 5 hrs – 3hrs 45 minutes = 75 minutes.
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