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JAMB Mathematics 2023 Paper

Question : 11

Total: 80

Solution:

Let T be the time taken and D is the distance

For the case given in the problem, the distance covered is directly proportional to the time taken i.e D α T

⇒ D = ST where S is the constant speed

D = 225 km and T = 4.5 hrs

∴ 225 = S x 4.5

S = $\frac{225}{4.5}$ = 50km/hr

When D = 150km

D = ST

150 = 50 $\times$ T

T = $\frac{150}{50}$ = 3 hrs

So it will take 3 hrs

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