Question

A car travelling with of its actual speed covers 42 km in 1 hr 40 min 48 sec. Find the actual speed of the car.

Answer 1

Answer:

1 hr =60 min

1 min =60 sec

so start with 48 sec which is 48 /60 min =0.8 min

it is now 1 hr 40.8 min

40.8 /60 =0.68 hrs

Time covered is 1.68 hrs

speed =distance/time

5/7*actual speed =42 km /1.68 hr=25

actual speed =25 ×7/8

= 35 km/hr