Aptitude Question ID: 106268
A truck travels at 90 km/hr for the first $latex 1\frac{1}{2}&s=1$ hours. After that it travels at 70 km/hr. Find the time taken by the truck to travel 310 kilometres.
[A]2.5 hours
[B]3 hours
[C]3.5 hours
[D]4 hours
4 hours
Distance covered by truck in $latex \frac{3}{2}&s=1$ hours = Speed $latex \times$ Time
$latex = 90\times \frac{3}{2} = 135\ km&s=1$
Remaining Distance = 310 – 135 = 175 km
∴ Time taken at 70 km/hr $latex = \frac{175}{70} = 2.5\ hours&s=1$
∴ Total time = 1.5 + 2.5 = 4 hours
Hence option [D] is correct answer.