With a speed of 48 km/h Raghu is able to complete his journey in 2 hours 32 minutes. If he wants to cover the same distance in 1 hour 36 minutes, then what will be the speed?
Answer & explanation
Correct answer: option 2
t = 2 hours 32 minutes = 2 + \(\frac{32}{60}\) = 2 + \(\frac{8}{15}\) = \(\frac{38}{15}\)
D = 48 × \(\frac{38}{15}\) = 16 × \(\frac{38}{5}\)
t = 1 + \(\frac{36}{60}\) = 1 + \(\frac{3}{5}\) = \(\frac{8}{5}\)
New speed,
S = \(\frac{16 × 38 × 5}{5 × 8}\) = 76 km/h