Question

1 Sujeet covers a distance in 40 minutes if he drives at a speed of 60 km/h on an average. Find the speed at which he must drive to reduce the time of journey by 25%?​

Answer 1

Answer:

Given speed =60 kmph

It means Sujal covered 60 km in 60 min (1 hour). So, in 40 min she will cover 40 km.

25% time reduced =40−25% of 40=30 min

Thus, Sujal need to cover 40 km in 30 min (0.5 hour)

Speed × Time = Distance

Speed ×0.5=40

Speed =80 kmph.

Answer 2

Answer:

80 km/h

Step-by-step explanation:

d=t×s

d=40×60÷60=40 km

time reduce by 25%

i. e. t=40-10=30min

s=d÷t

s=40÷30=4/3 km/min

s=(4/3) ×60=80 km/h