A taxi covered a route in 10 hours. First half speed of taxi is 21 km/hr and second half is 24 km/hr. Total time to cover the route in km ?

A) 224 km

B) 222 km

C) 322 km

D) 250 km

Let the distance be x km.

so ((1/2) *x /21) + ((1/2)*x /24) = 10

x/21 + x/24 = 20

15x = 168 * 20

x = 224 km.

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