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Roorkee express normally reaches its destination at 50 km/h in 30 hours. Find the speed at which it travels to reduce the time by 10 hours?

a) 38 km/h
b) 76 km/h
c) 75 km/h
d) 60 km/h

Answer: c
Explanation: let required speed be S km/h
50 × 30 = S × 20
S = 75 km/h

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