The time taken to reach Pluto will be 21.14 years.
Distance from Pluto to earth is given - 7,500,000,000km
Speed of ship= 40,500km/hr
Since 1 yr = 365 days= 365×24=8760 hrs.
Distance traveled by ship in 1 yr = 40500 ×8760 =354,780,000km
Time= 7,500,000,000/ 354,780,000=21.1398=21.14 years
Hence the ship would take 21.14 years to reach Pluto.
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