With a speed of 48 km/h. Raghu is able to complete his journey in 2 hours 28 minutes. If he wants to cover the same distance in 1 hour 36 minutes, then what should be his new speed?

74 km/h

2 hours 28 minutes = 2\(\frac{7}{15}\) hours   = \(\frac{37}{15}\) hours

Distance = Speed × Time

= 48 × \(\frac{37}{15}\) = 118.4 km

Now , 1 hour 36 minutes = 1\(\frac{3}{5}\) hours = \(\frac{8}{5}\) hours

Speed to cover distance in 1 hour 36 minutes = \(\frac{118.4 × 5 }{8}\)

= 74 km/h